645704260056 has 48 divisors (see below), whose sum is σ = 1796046766800. Its totient is φ = 209417596992.

The previous prime is 645704260039. The next prime is 645704260057. The reversal of 645704260056 is 650062407546.

645704260056 is a `hidden beast` number, since 6 + 4 + 570 + 4 + 26 + 0 + 0 + 56 = 666.

It is a super-3 number, since 3×645704260056³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645704259993 and 645704260020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645704260057) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121188076 + ... + 121193403.

It is an arithmetic number, because the mean of its divisors is an integer number (37417640975).

Almost surely, 2^645704260056 is an apocalyptic number.

It is an amenable number.

645704260056 is an abundant number, since it is smaller than the sum of its proper divisors (1150342506744).

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

645704260056 is a wasteful number, since it uses less digits than its factorization.

645704260056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242381528 (or 242381521 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 645704260056 in words is "six hundred forty-five billion, seven hundred four million, two hundred sixty thousand, fifty-six".