51009681560 has 32 divisors (see below), whose sum is σ = 114874634160. Its totient is φ = 20385588096.

The previous prime is 51009681557. The next prime is 51009681599. The reversal of 51009681560 is 6518690015.

51009681560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51009681560² (a number of 22 digits) contains 22 as substring.

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, 526154 + ... + 615513.

Almost surely, 2^51009681560 is an apocalyptic number.

It is an amenable number.

51009681560 is an abundant number, since it is smaller than the sum of its proper divisors (63864952600).

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

51009681560 is a wasteful number, since it uses less digits than its factorization.

51009681560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142795 (or 1142791 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 41.

The spelling of 51009681560 in words is "fifty-one billion, nine million, six hundred eighty-one thousand, five hundred sixty".