664656277 has 4 divisors (see below), whose sum is σ = 693554400. Its totient is φ = 635758156.

The previous prime is 664656269. The next prime is 664656301. The reversal of 664656277 is 772656466.

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 664656277 - 2³ = 664656269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664656277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664656257) 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, 14449027 + ... + 14449072.

It is an arithmetic number, because the mean of its divisors is an integer number (173388600).

Almost surely, 2^664656277 is an apocalyptic number.

It is an amenable number.

664656277 is a deficient number, since it is larger than the sum of its proper divisors (28898123).

664656277 is a wasteful number, since it uses less digits than its factorization.

664656277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28898122.

The product of its digits is 2540160, while the sum is 49.

The square root of 664656277 is about 25780.9285519354. The cubic root of 664656277 is about 872.7014620046.

The spelling of 664656277 in words is "six hundred sixty-four million, six hundred fifty-six thousand, two hundred seventy-seven".