661469445 has 48 divisors (see below), whose sum is σ = 1411143552. Its totient is φ = 279123840.

The previous prime is 661469411. The next prime is 661469483. The reversal of 661469445 is 544964166.

It is a happy number.

661469445 is a `hidden beast` number, since 66 + 146 + 9 + 445 = 666.

661469445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661469445 - 2⁷ = 661469317 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 661469445.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 76671 + ... + 84860.

It is an arithmetic number, because the mean of its divisors is an integer number (29398824).

Almost surely, 2^661469445 is an apocalyptic number.

661469445 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

661469445 is an abundant number, since it is smaller than the sum of its proper divisors (749674107).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661469445 is a wasteful number, since it uses less digits than its factorization.

661469445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161562 (or 161559 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 661469445 is about 25719.0482911013. The cubic root of 661469445 is about 871.3044442990.

The spelling of 661469445 in words is "six hundred sixty-one million, four hundred sixty-nine thousand, four hundred forty-five".