65157381 has 24 divisors (see below), whose sum is σ = 97560320. Its totient is φ = 41860800.

The previous prime is 65157371. The next prime is 65157397. The reversal of 65157381 is 18375156.

65157381 is a `hidden beast` number, since 6 + 5 + 1 + 573 + 81 = 666.

It is not a de Polignac number, because 65157381 - 2⁵ = 65157349 is a prime.

It is a super-2 number, since 2×65157381² = 8490968597558322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65157331) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 113826 + ... + 114396.

Almost surely, 2^65157381 is an apocalyptic number.

It is an amenable number.

65157381 is a deficient number, since it is larger than the sum of its proper divisors (32402939).

65157381 is a wasteful number, since it uses less digits than its factorization.

65157381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017 (or 1014 counting only the distinct ones).

The product of its digits is 25200, while the sum is 36.

The square root of 65157381 is about 8072.0122026667. The cubic root of 65157381 is about 402.3968198673.

The spelling of 65157381 in words is "sixty-five million, one hundred fifty-seven thousand, three hundred eighty-one".