51645272173 has 8 divisors (see below), whose sum is σ = 56973335040. Its totient is φ = 46422715680.

The previous prime is 51645272167. The next prime is 51645272177. The reversal of 51645272173 is 37127254615.

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 51645272173 - 2¹⁷ = 51645141101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51645272177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26375565 + ... + 26377522.

It is an arithmetic number, because the mean of its divisors is an integer number (7121666880).

Almost surely, 2^51645272173 is an apocalyptic number.

It is an amenable number.

51645272173 is a deficient number, since it is larger than the sum of its proper divisors (5328062867).

51645272173 is a wasteful number, since it uses less digits than its factorization.

51645272173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52753187.

The product of its digits is 352800, while the sum is 43.

The spelling of 51645272173 in words is "fifty-one billion, six hundred forty-five million, two hundred seventy-two thousand, one hundred seventy-three".