66315645 has 32 divisors (see below), whose sum is σ = 128615040. Its totient is φ = 32152320.

The previous prime is 66315629. The next prime is 66315653. The reversal of 66315645 is 54651366.

66315645 is a `hidden beast` number, since 6 + 6 + 3 + 1 + 5 + 645 = 666.

It is not a de Polignac number, because 66315645 - 2⁴ = 66315629 is a prime.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20844 + ... + 23813.

It is an arithmetic number, because the mean of its divisors is an integer number (4019220).

Almost surely, 2^66315645 is an apocalyptic number.

It is an amenable number.

66315645 is a deficient number, since it is larger than the sum of its proper divisors (62299395).

66315645 is a wasteful number, since it uses less digits than its factorization.

66315645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44682 (or 44676 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 66315645 is about 8143.4418399102. The cubic root of 66315645 is about 404.7672187680.

The spelling of 66315645 in words is "sixty-six million, three hundred fifteen thousand, six hundred forty-five".