645570163756 has 12 divisors (see below), whose sum is σ = 1291140327568. Its totient is φ = 276672927312.

The previous prime is 645570163751. The next prime is 645570163759. The reversal of 645570163756 is 657361075546.

645570163756 is an admirable number.

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 645570163697 and 645570163706.

It is not an unprimeable number, because it can be changed into a prime (645570163751) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11528038611 + ... + 11528038666.

Almost surely, 2^645570163756 is an apocalyptic number.

It is an amenable number.

645570163756 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

645570163756 is a wasteful number, since it uses less digits than its factorization.

645570163756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23056077288 (or 23056077286 counting only the distinct ones).

The product of its (nonzero) digits is 15876000, while the sum is 55.

The spelling of 645570163756 in words is "six hundred forty-five billion, five hundred seventy million, one hundred sixty-three thousand, seven hundred fifty-six".