645472757732076 has 18 divisors (see below), whose sum is σ = 1631611693156172. Its totient is φ = 215157585910680.

The previous prime is 645472757732017. The next prime is 645472757732113. The reversal of 645472757732076 is 670237757274546.

645472757732076 is a `hidden beast` number, since 6 + 4 + 5 + 4 + 7 + 27 + 577 + 3 + 20 + 7 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a junction number, because it is equal to n+sod(n) for n = 645472757731995 and 645472757732013.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8964899412910 + ... + 8964899412981.

Almost surely, 2^{645472757732076} is an apocalyptic number.

It is an amenable number.

645472757732076 is an abundant number, since it is smaller than the sum of its proper divisors (986138935424096).

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

645472757732076 is a wasteful number, since it uses less digits than its factorization.

645472757732076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17929798825901 (or 17929798825896 counting only the distinct ones).

The product of its (nonzero) digits is 2904249600, while the sum is 72.

The spelling of 645472757732076 in words is "six hundred forty-five trillion, four hundred seventy-two billion, seven hundred fifty-seven million, seven hundred thirty-two thousand, seventy-six".