664950775 has 12 divisors (see below), whose sum is σ = 851137984. Its totient is φ = 514800000.

The previous prime is 664950757. The next prime is 664950787. The reversal of 664950775 is 577059466.

It is not a de Polignac number, because 664950775 - 2¹⁷ = 664819703 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 428226 + ... + 429775.

Almost surely, 2^664950775 is an apocalyptic number.

664950775 is a deficient number, since it is larger than the sum of its proper divisors (186187209).

664950775 is a wasteful number, since it uses less digits than its factorization.

664950775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858042 (or 858037 counting only the distinct ones).

The product of its (nonzero) digits is 1587600, while the sum is 49.

The square root of 664950775 is about 25786.6394669798. The cubic root of 664950775 is about 872.8303360782.

The spelling of 664950775 in words is "six hundred sixty-four million, nine hundred fifty thousand, seven hundred seventy-five".