51621750552552 has 64 divisors (see below), whose sum is σ = 135848032320000. Its totient is φ = 16301446997184.

The previous prime is 51621750552509. The next prime is 51621750552601. The reversal of 51621750552552 is 25525505712615.

It is a junction number, because it is equal to n+sod(n) for n = 51621750552495 and 51621750552504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51893949 + ... + 52879347.

It is an arithmetic number, because the mean of its divisors is an integer number (2122625505000).

Almost surely, 2^{51621750552552} is an apocalyptic number.

It is an amenable number.

51621750552552 is an abundant number, since it is smaller than the sum of its proper divisors (84226281767448).

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

51621750552552 is a wasteful number, since it uses less digits than its factorization.

51621750552552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100310 (or 1100306 counting only the distinct ones).

The product of its (nonzero) digits is 5250000, while the sum is 51.

The spelling of 51621750552552 in words is "fifty-one trillion, six hundred twenty-one billion, seven hundred fifty million, five hundred fifty-two thousand, five hundred fifty-two".