649556858670 has 16 divisors (see below), whose sum is σ = 1558936460880. Its totient is φ = 173215162304.

The previous prime is 649556858669. The next prime is 649556858777. The reversal of 649556858670 is 76858655946.

It is a super-2 number, since 2×649556858670² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 649556858595 and 649556858604.

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, 10825947615 + ... + 10825947674.

It is an arithmetic number, because the mean of its divisors is an integer number (97433528805).

Almost surely, 2^649556858670 is an apocalyptic number.

649556858670 is an abundant number, since it is smaller than the sum of its proper divisors (909379602210).

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

649556858670 is a wasteful number, since it uses less digits than its factorization.

649556858670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21651895299.

The product of its (nonzero) digits is 435456000, while the sum is 69.

The spelling of 649556858670 in words is "six hundred forty-nine billion, five hundred fifty-six million, eight hundred fifty-eight thousand, six hundred seventy".