66865672 has 32 divisors (see below), whose sum is σ = 127411200. Its totient is φ = 32894784.

The previous prime is 66865651. The next prime is 66865681. The reversal of 66865672 is 27656866.

It is a super-3 number, since 3×66865672³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174393 + ... + 174775.

It is an arithmetic number, because the mean of its divisors is an integer number (3981600).

Almost surely, 2^66865672 is an apocalyptic number.

It is an amenable number.

66865672 is a deficient number, since it is larger than the sum of its proper divisors (60545528).

66865672 is a wasteful number, since it uses less digits than its factorization.

66865672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 685 (or 681 counting only the distinct ones).

The product of its digits is 725760, while the sum is 46.

The square root of 66865672 is about 8177.1432664470. The cubic root of 66865672 is about 405.8831957909.

The spelling of 66865672 in words is "sixty-six million, eight hundred sixty-five thousand, six hundred seventy-two".