51671921772 has 48 divisors (see below), whose sum is σ = 121689624672. Its totient is φ = 17063854080.

The previous prime is 51671921767. The next prime is 51671921779. The reversal of 51671921772 is 27712917615.

51671921772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51671921772² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51671921779) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3541372 + ... + 3555932.

It is an arithmetic number, because the mean of its divisors is an integer number (2535200514).

Almost surely, 2^51671921772 is an apocalyptic number.

It is an amenable number.

51671921772 is an abundant number, since it is smaller than the sum of its proper divisors (70017702900).

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

51671921772 is a wasteful number, since it uses less digits than its factorization.

51671921772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17298 (or 17296 counting only the distinct ones).

The product of its digits is 370440, while the sum is 48.

The spelling of 51671921772 in words is "fifty-one billion, six hundred seventy-one million, nine hundred twenty-one thousand, seven hundred seventy-two".