1645366005 has 12 divisors (see below), whose sum is σ = 2851967820. Its totient is φ = 877528512.

The previous prime is 1645366003. The next prime is 1645366091. The reversal of 1645366005 is 5006635461.

1645366005 is a `hidden beast` number, since 1 + 6 + 45 + 3 + 6 + 600 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 226261764 + 1419104241 = 15042^2 + 37671^2 .

It is not a de Polignac number, because 1645366005 - 2¹ = 1645366003 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1645366001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18281800 + ... + 18281889.

It is an arithmetic number, because the mean of its divisors is an integer number (237663985).

Almost surely, 2^1645366005 is an apocalyptic number.

1645366005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1645366005 is a deficient number, since it is larger than the sum of its proper divisors (1206601815).

1645366005 is a wasteful number, since it uses less digits than its factorization.

1645366005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36563700 (or 36563697 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 1645366005 is about 40563.1113821413. Note that the first 3 decimals coincide. The cubic root of 1645366005 is about 1180.5584843156.

The spelling of 1645366005 in words is "one billion, six hundred forty-five million, three hundred sixty-six thousand, five".