66565131 has 8 divisors (see below), whose sum is σ = 88957440. Its totient is φ = 44274792.

The previous prime is 66565129. The next prime is 66565139. The reversal of 66565131 is 13156566.

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

It is not a de Polignac number, because 66565131 - 2¹ = 66565129 is a prime.

It is a super-2 number, since 2×66565131² = 8861833330094322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66565092 and 66565101.

It is not an unprimeable number, because it can be changed into a prime (66565139) 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, 23955 + ... + 26588.

It is an arithmetic number, because the mean of its divisors is an integer number (11119680).

Almost surely, 2^66565131 is an apocalyptic number.

66565131 is a deficient number, since it is larger than the sum of its proper divisors (22392309).

66565131 is a wasteful number, since it uses less digits than its factorization.

66565131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50985.

The product of its digits is 16200, while the sum is 33.

The square root of 66565131 is about 8158.7456756538. The cubic root of 66565131 is about 405.2741749642.

The spelling of 66565131 in words is "sixty-six million, five hundred sixty-five thousand, one hundred thirty-one".