66965977 has 16 divisors (see below), whose sum is σ = 74426688. Its totient is φ = 59866560.

The previous prime is 66965971. The next prime is 66965981. The reversal of 66965977 is 77956966.

It is a de Polignac number, because none of the positive numbers 2^k-66965977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66965971) 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, 56602 + ... + 57772.

It is an arithmetic number, because the mean of its divisors is an integer number (4651668).

Almost surely, 2^66965977 is an apocalyptic number.

It is an amenable number.

66965977 is a deficient number, since it is larger than the sum of its proper divisors (7460711).

66965977 is a wasteful number, since it uses less digits than its factorization.

66965977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320.

The product of its digits is 4286520, while the sum is 55.

The square root of 66965977 is about 8183.2742224613. The cubic root of 66965977 is about 406.0860491251.

The spelling of 66965977 in words is "sixty-six million, nine hundred sixty-five thousand, nine hundred seventy-seven".