51173793872 has 20 divisors (see below), whose sum is σ = 100263264660. Its totient is φ = 25299403008.

The previous prime is 51173793859. The next prime is 51173793899. The reversal of 51173793872 is 27839737115.

It can be written as a sum of positive squares in 2 ways, for example, as 29823908416 + 21349885456 = 172696^2 + 146116^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17966903 + ... + 17969750.

It is an arithmetic number, because the mean of its divisors is an integer number (5013163233).

Almost surely, 2^51173793872 is an apocalyptic number.

It is an amenable number.

51173793872 is a deficient number, since it is larger than the sum of its proper divisors (49089470788).

51173793872 is a wasteful number, since it uses less digits than its factorization.

51173793872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35936750 (or 35936744 counting only the distinct ones).

The product of its digits is 2222640, while the sum is 53.

The spelling of 51173793872 in words is "fifty-one billion, one hundred seventy-three million, seven hundred ninety-three thousand, eight hundred seventy-two".