51564342646 has 16 divisors (see below), whose sum is σ = 78122938320. Its totient is φ = 25523432800.

The previous prime is 51564342601. The next prime is 51564342737. The reversal of 51564342646 is 64624346515.

51564342646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51564342596 and 51564342605.

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, 2126925 + ... + 2151031.

It is an arithmetic number, because the mean of its divisors is an integer number (4882683645).

Almost surely, 2^51564342646 is an apocalyptic number.

51564342646 is a deficient number, since it is larger than the sum of its proper divisors (26558595674).

51564342646 is a wasteful number, since it uses less digits than its factorization.

51564342646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34799.

The product of its digits is 2073600, while the sum is 46.

The spelling of 51564342646 in words is "fifty-one billion, five hundred sixty-four million, three hundred forty-two thousand, six hundred forty-six".