51216117914 has 12 divisors (see below), whose sum is σ = 82735593066. Its totient is φ = 23637675672.

The previous prime is 51216117839. The next prime is 51216117917. The reversal of 51216117914 is 41971161215.

It can be written as a sum of positive squares in only one way, i.e., 49246267225 + 1969850689 = 221915^2 + 44383^2 .

It is a super-2 number, since 2×51216117914² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51216117917) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1131767 + ... + 1176149.

Almost surely, 2^51216117914 is an apocalyptic number.

51216117914 is a deficient number, since it is larger than the sum of its proper divisors (31519475152).

51216117914 is an frugal number, since it uses more digits than its factorization.

51216117914 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88781 (or 44398 counting only the distinct ones).

The product of its digits is 15120, while the sum is 38.

The spelling of 51216117914 in words is "fifty-one billion, two hundred sixteen million, one hundred seventeen thousand, nine hundred fourteen".