664231677 has 8 divisors (see below), whose sum is σ = 887582016. Its totient is φ = 441851232.

The previous prime is 664231657. The next prime is 664231679. The reversal of 664231677 is 776132466.

It is a happy number.

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

It is not a de Polignac number, because 664231677 - 2¹⁶ = 664166141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664231679) 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, 240873 + ... + 243614.

It is an arithmetic number, because the mean of its divisors is an integer number (110947752).

Almost surely, 2^664231677 is an apocalyptic number.

It is an amenable number.

664231677 is a deficient number, since it is larger than the sum of its proper divisors (223350339).

664231677 is a wasteful number, since it uses less digits than its factorization.

664231677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 484947.

The product of its digits is 254016, while the sum is 42.

The square root of 664231677 is about 25772.6924670280. The cubic root of 664231677 is about 872.5155874972.

The spelling of 664231677 in words is "six hundred sixty-four million, two hundred thirty-one thousand, six hundred seventy-seven".