646552656211400 has 24 divisors (see below), whose sum is σ = 1503234925691970. Its totient is φ = 258621062484480.

The previous prime is 646552656211367. The next prime is 646552656211417. The reversal of 646552656211400 is 4112656255646.

It can be written as a sum of positive squares in 3 ways, for example, as 628013724280804 + 18538931930596 = 25060202^2 + 4305686^2 .

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, 1616381640329 + ... + 1616381640728.

Almost surely, 2^{646552656211400} is an apocalyptic number.

It is an amenable number.

646552656211400 is an abundant number, since it is smaller than the sum of its proper divisors (856682269480570).

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

646552656211400 is a wasteful number, since it uses less digits than its factorization.

646552656211400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232763281073 (or 3232763281064 counting only the distinct ones).

The product of its (nonzero) digits is 10368000, while the sum is 53.

The spelling of 646552656211400 in words is "six hundred forty-six trillion, five hundred fifty-two billion, six hundred fifty-six million, two hundred eleven thousand, four hundred".