66974677 has 16 divisors (see below), whose sum is σ = 87897600. Its totient is φ = 49440240.

The previous prime is 66974657. The next prime is 66974707. The reversal of 66974677 is 77647966.

It is a cyclic number.

It is not a de Polignac number, because 66974677 - 2⁷ = 66974549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66974627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21427 + ... + 24352.

It is an arithmetic number, because the mean of its divisors is an integer number (5493600).

Almost surely, 2^66974677 is an apocalyptic number.

It is an amenable number.

66974677 is a deficient number, since it is larger than the sum of its proper divisors (20922923).

66974677 is a wasteful number, since it uses less digits than its factorization.

66974677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45816.

The product of its digits is 2667168, while the sum is 52.

The square root of 66974677 is about 8183.8057772652. The cubic root of 66974677 is about 406.1036341526.

Subtracting 66974677 from its reverse (77647966), we obtain a square (10673289 = 3267²).

The spelling of 66974677 in words is "sixty-six million, nine hundred seventy-four thousand, six hundred seventy-seven".