66977013 has 8 divisors (see below), whose sum is σ = 89340928. Its totient is φ = 44632224.

The previous prime is 66976981. The next prime is 66977017. The reversal of 66977013 is 31077966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66977013 - 2⁵ = 66976981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66977017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9420 + ... + 14922.

It is an arithmetic number, because the mean of its divisors is an integer number (11167616).

Almost surely, 2^66977013 is an apocalyptic number.

It is an amenable number.

66977013 is a deficient number, since it is larger than the sum of its proper divisors (22363915).

66977013 is a wasteful number, since it uses less digits than its factorization.

66977013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9563.

The product of its (nonzero) digits is 47628, while the sum is 39.

The square root of 66977013 is about 8183.9484969054. The cubic root of 66977013 is about 406.1083555742.

The spelling of 66977013 in words is "sixty-six million, nine hundred seventy-seven thousand, thirteen".