51165456415 has 4 divisors (see below), whose sum is σ = 61398547704. Its totient is φ = 40932365128.

The previous prime is 51165456373. The next prime is 51165456467. The reversal of 51165456415 is 51465456115.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51465456115 = 5 ⋅10293091223.

It is a cyclic number.

It is not a de Polignac number, because 51165456415 - 2¹⁹ = 51164932127 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5116545637 + ... + 5116545646.

It is an arithmetic number, because the mean of its divisors is an integer number (15349636926).

Almost surely, 2^51165456415 is an apocalyptic number.

51165456415 is a deficient number, since it is larger than the sum of its proper divisors (10233091289).

51165456415 is a wasteful number, since it uses less digits than its factorization.

51165456415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10233091288.

The product of its digits is 360000, while the sum is 43.

The spelling of 51165456415 in words is "fifty-one billion, one hundred sixty-five million, four hundred fifty-six thousand, four hundred fifteen".