51516165445 has 8 divisors (see below), whose sum is σ = 62690094720. Its totient is φ = 40632468240.

The previous prime is 51516165431. The next prime is 51516165479. The reversal of 51516165445 is 54456161515.

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

It is not a de Polignac number, because 51516165445 - 2²⁵ = 51482611013 is a prime.

It is a super-2 number, since 2×51516165445² (a number of 22 digits) contains 22 as substring.

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, 72557625 + ... + 72558334.

It is an arithmetic number, because the mean of its divisors is an integer number (7836261840).

Almost surely, 2^51516165445 is an apocalyptic number.

It is an amenable number.

51516165445 is a deficient number, since it is larger than the sum of its proper divisors (11173929275).

51516165445 is a wasteful number, since it uses less digits than its factorization.

51516165445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145116035.

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

The spelling of 51516165445 in words is "fifty-one billion, five hundred sixteen million, one hundred sixty-five thousand, four hundred forty-five".