51665157 has 12 divisors (see below), whose sum is σ = 74764300. Its totient is φ = 34380288.

The previous prime is 51665149. The next prime is 51665191. The reversal of 51665157 is 75156615.

It can be written as a sum of positive squares in 2 ways, for example, as 40335201 + 11329956 = 6351^2 + 3366^2 .

It is not a de Polignac number, because 51665157 - 2³ = 51665149 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 (51665137) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 219 + ... + 10167.

Almost surely, 2^51665157 is an apocalyptic number.

It is an amenable number.

51665157 is a deficient number, since it is larger than the sum of its proper divisors (23099143).

51665157 is a wasteful number, since it uses less digits than its factorization.

51665157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10532 (or 10529 counting only the distinct ones).

The product of its digits is 31500, while the sum is 36.

The square root of 51665157 is about 7187.8478698425. The cubic root of 51665157 is about 372.4482326752.

The spelling of 51665157 in words is "fifty-one million, six hundred sixty-five thousand, one hundred fifty-seven".