66131265 has 16 divisors (see below), whose sum is σ = 106860096. Its totient is φ = 34920000.

The previous prime is 66131251. The next prime is 66131287. The reversal of 66131265 is 56213166.

It is not a de Polignac number, because 66131265 - 2⁴ = 66131249 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20311 + ... + 23340.

It is an arithmetic number, because the mean of its divisors is an integer number (6678756).

Almost surely, 2^66131265 is an apocalyptic number.

It is an amenable number.

66131265 is a deficient number, since it is larger than the sum of its proper divisors (40728831).

66131265 is a wasteful number, since it uses less digits than its factorization.

66131265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43760.

The product of its digits is 6480, while the sum is 30.

The square root of 66131265 is about 8132.1131939982. The cubic root of 66131265 is about 404.3917404863.

The spelling of 66131265 in words is "sixty-six million, one hundred thirty-one thousand, two hundred sixty-five".