66317977 has 4 divisors (see below), whose sum is σ = 72346896. Its totient is φ = 60289060.

The previous prime is 66317939. The next prime is 66318013. The reversal of 66317977 is 77971366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66317977 - 2¹⁵ = 66285209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66317177) 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, 3014443 + ... + 3014464.

It is an arithmetic number, because the mean of its divisors is an integer number (18086724).

Almost surely, 2^66317977 is an apocalyptic number.

It is an amenable number.

66317977 is a deficient number, since it is larger than the sum of its proper divisors (6028919).

66317977 is a wasteful number, since it uses less digits than its factorization.

66317977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6028918.

The product of its digits is 333396, while the sum is 46.

The square root of 66317977 is about 8143.5850213527. The cubic root of 66317977 is about 404.7719632799.

The spelling of 66317977 in words is "sixty-six million, three hundred seventeen thousand, nine hundred seventy-seven".