51511061656 has 16 divisors (see below), whose sum is σ = 96642847440. Its totient is φ = 25739635680.

The previous prime is 51511061543. The next prime is 51511061669. The reversal of 51511061656 is 65616011515.

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, 1973116 + ... + 1999051.

It is an arithmetic number, because the mean of its divisors is an integer number (6040177965).

Almost surely, 2^51511061656 is an apocalyptic number.

It is an amenable number.

51511061656 is a deficient number, since it is larger than the sum of its proper divisors (45131785784).

51511061656 is a wasteful number, since it uses less digits than its factorization.

51511061656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973794 (or 3973790 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 37.

The spelling of 51511061656 in words is "fifty-one billion, five hundred eleven million, sixty-one thousand, six hundred fifty-six".