445666545 has 12 divisors (see below), whose sum is σ = 772488756. Its totient is φ = 237688800.

The previous prime is 445666541. The next prime is 445666547. The reversal of 445666545 is 545666544.

It can be written as a sum of positive squares in 2 ways, for example, as 81162081 + 364504464 = 9009^2 + 19092^2 .

It is not a de Polignac number, because 445666545 - 2² = 445666541 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 9903701 = 445666545 / (4 + 4 + 5 + 6 + 6 + 6 + 5 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 445666545.

It is not an unprimeable number, because it can be changed into a prime (445666541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4951806 + ... + 4951895.

It is an arithmetic number, because the mean of its divisors is an integer number (64374063).

Almost surely, 2^445666545 is an apocalyptic number.

445666545 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

445666545 is a deficient number, since it is larger than the sum of its proper divisors (326822211).

445666545 is a wasteful number, since it uses less digits than its factorization.

445666545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9903712 (or 9903709 counting only the distinct ones).

The product of its digits is 1728000, while the sum is 45.

The square root of 445666545 is about 21110.8158298063. The cubic root of 445666545 is about 763.8416661781.

Subtracting 445666545 from its reverse (545666544), we obtain a palindrome (99999999).

The spelling of 445666545 in words is "four hundred forty-five million, six hundred sixty-six thousand, five hundred forty-five".