664035969 has 4 divisors (see below), whose sum is σ = 885381296. Its totient is φ = 442690644.

The previous prime is 664035961. The next prime is 664035979. The reversal of 664035969 is 969530466.

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 not a de Polignac number, because 664035969 - 2³ = 664035961 is a prime.

It is a super-2 number, since 2×664035969² = 881887536251537922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664035961) 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, 110672659 + ... + 110672664.

It is an arithmetic number, because the mean of its divisors is an integer number (221345324).

Almost surely, 2^664035969 is an apocalyptic number.

It is an amenable number.

664035969 is a deficient number, since it is larger than the sum of its proper divisors (221345327).

664035969 is a wasteful number, since it uses less digits than its factorization.

664035969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221345326.

The product of its (nonzero) digits is 1049760, while the sum is 48.

The square root of 664035969 is about 25768.8953779552. The cubic root of 664035969 is about 872.4298869503.

The spelling of 664035969 in words is "six hundred sixty-four million, thirty-five thousand, nine hundred sixty-nine".