645553340056 has 32 divisors (see below), whose sum is σ = 1266316390080. Its totient is φ = 308203974400.

The previous prime is 645553340041. The next prime is 645553340111. The reversal of 645553340056 is 650043355546.

It is a super-2 number, since 2×645553340056² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 645553339988 and 645553340015.

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, 20922355 + ... + 20953186.

It is an arithmetic number, because the mean of its divisors is an integer number (39572387190).

Almost surely, 2^645553340056 is an apocalyptic number.

It is an amenable number.

645553340056 is a deficient number, since it is larger than the sum of its proper divisors (620763050024).

645553340056 is a wasteful number, since it uses less digits than its factorization.

645553340056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41875635 (or 41875631 counting only the distinct ones).

The product of its (nonzero) digits is 3240000, while the sum is 46.

The spelling of 645553340056 in words is "six hundred forty-five billion, five hundred fifty-three million, three hundred forty thousand, fifty-six".