645100061504 has 56 divisors (see below), whose sum is σ = 1351567020000. Its totient is φ = 304650339840.

The previous prime is 645100061491. The next prime is 645100061513. The reversal of 645100061504 is 405160001546.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 398879 + ... + 1203870.

Almost surely, 2^645100061504 is an apocalyptic number.

645100061504 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

645100061504 is an abundant number, since it is smaller than the sum of its proper divisors (706466958496).

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

645100061504 is a wasteful number, since it uses less digits than its factorization.

645100061504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603111 (or 1603101 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The spelling of 645100061504 in words is "six hundred forty-five billion, one hundred million, sixty-one thousand, five hundred four".