51111111165 has 8 divisors (see below), whose sum is σ = 81777777888. Its totient is φ = 27259259280.

The previous prime is 51111111143. The next prime is 51111111173. The reversal of 51111111165 is 56111111115.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51111111165 - 2¹⁷ = 51110980093 is a prime.

It is a super-2 number, since 2×51111111165² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1703703691 + ... + 1703703720.

It is an arithmetic number, because the mean of its divisors is an integer number (10222222236).

Almost surely, 2^51111111165 is an apocalyptic number.

It is an amenable number.

51111111165 is a deficient number, since it is larger than the sum of its proper divisors (30666666723).

51111111165 is a wasteful number, since it uses less digits than its factorization.

51111111165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3407407419.

The product of its digits is 150, while the sum is 24.

The spelling of 51111111165 in words is "fifty-one billion, one hundred eleven million, one hundred eleven thousand, one hundred sixty-five".