51506320772 has 24 divisors (see below), whose sum is σ = 95819485440. Its totient is φ = 24156165600.

The previous prime is 51506320771. The next prime is 51506320967. The reversal of 51506320772 is 27702360515.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (51506320771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3347348 + ... + 3362699.

It is an arithmetic number, because the mean of its divisors is an integer number (3992478560).

Almost surely, 2^51506320772 is an apocalyptic number.

It is an amenable number.

51506320772 is a deficient number, since it is larger than the sum of its proper divisors (44313164668).

51506320772 is a wasteful number, since it uses less digits than its factorization.

51506320772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6710171 (or 6710169 counting only the distinct ones).

The product of its (nonzero) digits is 88200, while the sum is 38.

The spelling of 51506320772 in words is "fifty-one billion, five hundred six million, three hundred twenty thousand, seven hundred seventy-two".