51015061656 has 80 divisors (see below), whose sum is σ = 153880927200. Its totient is φ = 15696939456.

The previous prime is 51015061633. The next prime is 51015061667. The reversal of 51015061656 is 65616051015.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51015061656.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3019536 + ... + 3036383.

It is an arithmetic number, because the mean of its divisors is an integer number (1923511590).

Almost surely, 2^51015061656 is an apocalyptic number.

It is an amenable number.

51015061656 is an abundant number, since it is smaller than the sum of its proper divisors (102865865544).

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

51015061656 is a wasteful number, since it uses less digits than its factorization.

51015061656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6055950 (or 6055937 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 51015061656 in words is "fifty-one billion, fifteen million, sixty-one thousand, six hundred fifty-six".