664883961 has 8 divisors (see below), whose sum is σ = 1013156544. Its totient is φ = 379933680.

The previous prime is 664883951. The next prime is 664883963. The reversal of 664883961 is 169388466.

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

It is not a de Polignac number, because 664883961 - 2⁷ = 664883833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664883963) 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, 15830550 + ... + 15830591.

It is an arithmetic number, because the mean of its divisors is an integer number (126644568).

Almost surely, 2^664883961 is an apocalyptic number.

It is an amenable number.

664883961 is a deficient number, since it is larger than the sum of its proper divisors (348272583).

664883961 is a wasteful number, since it uses less digits than its factorization.

664883961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31661151.

The product of its digits is 1492992, while the sum is 51.

The square root of 664883961 is about 25785.3439185907. The cubic root of 664883961 is about 872.8011012127.

It can be divided in two parts, 6648 and 83961, that added together give a palindrome (90609).

The spelling of 664883961 in words is "six hundred sixty-four million, eight hundred eighty-three thousand, nine hundred sixty-one".