645123035204 has 24 divisors (see below), whose sum is σ = 1139484053400. Its totient is φ = 319557000960.

The previous prime is 645123035197. The next prime is 645123035209. The reversal of 645123035204 is 402530321546.

It can be written as a sum of positive squares in 4 ways, for example, as 14445636100 + 630677399104 = 120190^2 + 794152^2 .

It is not an unprimeable number, because it can be changed into a prime (645123035209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3090902 + ... + 3293010.

It is an arithmetic number, because the mean of its divisors is an integer number (47478502225).

Almost surely, 2^645123035204 is an apocalyptic number.

It is an amenable number.

645123035204 is a deficient number, since it is larger than the sum of its proper divisors (494361018196).

645123035204 is a wasteful number, since it uses less digits than its factorization.

645123035204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209543 (or 209541 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 35.

The spelling of 645123035204 in words is "six hundred forty-five billion, one hundred twenty-three million, thirty-five thousand, two hundred four".