66244665 has 16 divisors (see below), whose sum is σ = 112226688. Its totient is φ = 33252096.

The previous prime is 66244637. The next prime is 66244691. The reversal of 66244665 is 56644266.

It is not a de Polignac number, because 66244665 - 2⁷ = 66244537 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, 129637 + ... + 130146.

It is an arithmetic number, because the mean of its divisors is an integer number (7014168).

Almost surely, 2^66244665 is an apocalyptic number.

It is an amenable number.

66244665 is a deficient number, since it is larger than the sum of its proper divisors (45982023).

66244665 is a wasteful number, since it uses less digits than its factorization.

66244665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 259808.

The product of its digits is 207360, while the sum is 39.

The square root of 66244665 is about 8139.0825650069. The cubic root of 66244665 is about 404.6227549507.

The spelling of 66244665 in words is "sixty-six million, two hundred forty-four thousand, six hundred sixty-five".