645523165532 has 48 divisors (see below), whose sum is σ = 1322668170432. Its totient is φ = 269878033920.

The previous prime is 645523165513. The next prime is 645523165561. The reversal of 645523165532 is 235561325546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14779358 + ... + 14822970.

It is an arithmetic number, because the mean of its divisors is an integer number (27555586884).

Almost surely, 2^645523165532 is an apocalyptic number.

It is an amenable number.

645523165532 is an abundant number, since it is smaller than the sum of its proper divisors (677145004900).

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

645523165532 is a wasteful number, since it uses less digits than its factorization.

645523165532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56558 (or 56556 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 47.

The spelling of 645523165532 in words is "six hundred forty-five billion, five hundred twenty-three million, one hundred sixty-five thousand, five hundred thirty-two".