645606555356 has 12 divisors (see below), whose sum is σ = 1291213110768. Its totient is φ = 276688523712.

The previous prime is 645606555337. The next prime is 645606555457. The reversal of 645606555356 is 653555606546.

645606555356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

645606555356 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11528688461 + ... + 11528688516.

It is an arithmetic number, because the mean of its divisors is an integer number (107601092564).

Almost surely, 2^645606555356 is an apocalyptic number.

It is an amenable number.

645606555356 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.

645606555356 is a wasteful number, since it uses less digits than its factorization.

645606555356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23057376988 (or 23057376986 counting only the distinct ones).

The product of its (nonzero) digits is 48600000, while the sum is 56.

The spelling of 645606555356 in words is "six hundred forty-five billion, six hundred six million, five hundred fifty-five thousand, three hundred fifty-six".