664035971 has 8 divisors (see below), whose sum is σ = 680245104. Its totient is φ = 647861760.

The previous prime is 664035961. The next prime is 664035979. The reversal of 664035971 is 179530466.

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

It is a cyclic number.

It is not a de Polignac number, because 664035971 - 2¹⁸ = 663773827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664035979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32051 + ... + 48531.

It is an arithmetic number, because the mean of its divisors is an integer number (85030638).

Almost surely, 2^664035971 is an apocalyptic number.

664035971 is a deficient number, since it is larger than the sum of its proper divisors (16209133).

664035971 is a wasteful number, since it uses less digits than its factorization.

664035971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17461.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 664035971 is about 25768.8954167617. The cubic root of 664035971 is about 872.4298878262.

The spelling of 664035971 in words is "six hundred sixty-four million, thirty-five thousand, nine hundred seventy-one".