51720325156 has 24 divisors (see below), whose sum is σ = 96370132320. Its totient is φ = 24202998912.

The previous prime is 51720325121. The next prime is 51720325159. The reversal of 51720325156 is 65152302715.

It is not an unprimeable number, because it can be changed into a prime (51720325159) 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, 2112390 + ... + 2136733.

It is an arithmetic number, because the mean of its divisors is an integer number (4015422180).

Almost surely, 2^51720325156 is an apocalyptic number.

It is an amenable number.

51720325156 is a deficient number, since it is larger than the sum of its proper divisors (44649807164).

51720325156 is a wasteful number, since it uses less digits than its factorization.

51720325156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249323 (or 4249321 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 37.

The spelling of 51720325156 in words is "fifty-one billion, seven hundred twenty million, three hundred twenty-five thousand, one hundred fifty-six".