51111113865 has 64 divisors (see below), whose sum is σ = 95697254400. Its totient is φ = 22806572544.

The previous prime is 51111113863. The next prime is 51111113881. The reversal of 51111113865 is 56831111115.

It is not a de Polignac number, because 51111113865 - 2¹ = 51111113863 is a prime.

It is a super-2 number, since 2×51111113865² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51111113863) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9429126 + ... + 9434544.

It is an arithmetic number, because the mean of its divisors is an integer number (1495269600).

Almost surely, 2^51111113865 is an apocalyptic number.

It is an amenable number.

51111113865 is a deficient number, since it is larger than the sum of its proper divisors (44586140535).

51111113865 is a wasteful number, since it uses less digits than its factorization.

51111113865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7566.

The product of its digits is 3600, while the sum is 33.

The spelling of 51111113865 in words is "fifty-one billion, one hundred eleven million, one hundred thirteen thousand, eight hundred sixty-five".