66879507 has 4 divisors (see below), whose sum is σ = 89172680. Its totient is φ = 44586336.

The previous prime is 66879503. The next prime is 66879521. The reversal of 66879507 is 70597866.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 66879507 - 2² = 66879503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66879503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11146582 + ... + 11146587.

It is an arithmetic number, because the mean of its divisors is an integer number (22293170).

Almost surely, 2^66879507 is an apocalyptic number.

66879507 is a deficient number, since it is larger than the sum of its proper divisors (22293173).

66879507 is a wasteful number, since it uses less digits than its factorization.

66879507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22293172.

The product of its (nonzero) digits is 635040, while the sum is 48.

The square root of 66879507 is about 8177.9891782760. The cubic root of 66879507 is about 405.9111872679.

The spelling of 66879507 in words is "sixty-six million, eight hundred seventy-nine thousand, five hundred seven".