51665511117 has 16 divisors (see below), whose sum is σ = 75241408320. Its totient is φ = 31274275200.

The previous prime is 51665511101. The next prime is 51665511119. The reversal of 51665511117 is 71111556615.

It is not a de Polignac number, because 51665511117 - 2⁴ = 51665511101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51665511119) 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, 926392 + ... + 980577.

It is an arithmetic number, because the mean of its divisors is an integer number (4702588020).

Almost surely, 2^51665511117 is an apocalyptic number.

It is an amenable number.

51665511117 is a deficient number, since it is larger than the sum of its proper divisors (23575897203).

51665511117 is a wasteful number, since it uses less digits than its factorization.

51665511117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1907804.

The product of its digits is 31500, while the sum is 39.

The spelling of 51665511117 in words is "fifty-one billion, six hundred sixty-five million, five hundred eleven thousand, one hundred seventeen".