66131507 has 16 divisors (see below), whose sum is σ = 73032960. Its totient is φ = 59508000.

The previous prime is 66131501. The next prime is 66131531. The reversal of 66131507 is 70513166.

It is a cyclic number.

It is not a de Polignac number, because 66131507 - 2⁸ = 66131251 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66131507.

It is not an unprimeable number, because it can be changed into a prime (66131501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115532 + ... + 116102.

It is an arithmetic number, because the mean of its divisors is an integer number (4564560).

Almost surely, 2^66131507 is an apocalyptic number.

66131507 is a deficient number, since it is larger than the sum of its proper divisors (6901453).

66131507 is a wasteful number, since it uses less digits than its factorization.

66131507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 66131507 is about 8132.1280732659. The cubic root of 66131507 is about 404.3922337612.

The spelling of 66131507 in words is "sixty-six million, one hundred thirty-one thousand, five hundred seven".