51625621816 has 8 divisors (see below), whose sum is σ = 96798040920. Its totient is φ = 25812810904.

The previous prime is 51625621813. The next prime is 51625621837. The reversal of 51625621816 is 61812652615.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51625621813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3226601356 + ... + 3226601371.

It is an arithmetic number, because the mean of its divisors is an integer number (12099755115).

Almost surely, 2^51625621816 is an apocalyptic number.

It is an amenable number.

51625621816 is a deficient number, since it is larger than the sum of its proper divisors (45172419104).

51625621816 is a wasteful number, since it uses less digits than its factorization.

51625621816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6453202733 (or 6453202729 counting only the distinct ones).

The product of its digits is 172800, while the sum is 43.

The spelling of 51625621816 in words is "fifty-one billion, six hundred twenty-five million, six hundred twenty-one thousand, eight hundred sixteen".