664687631801 has 8 divisors (see below), whose sum is σ = 676431249984. Its totient is φ = 653010175440.

The previous prime is 664687631753. The next prime is 664687631807. The reversal of 664687631801 is 108136786466.

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 664687631801 - 2²² = 664683437497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664687631807) 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, 16520186 + ... + 16560371.

It is an arithmetic number, because the mean of its divisors is an integer number (84553906248).

Almost surely, 2^664687631801 is an apocalyptic number.

It is an amenable number.

664687631801 is a deficient number, since it is larger than the sum of its proper divisors (11743618183).

664687631801 is a wasteful number, since it uses less digits than its factorization.

664687631801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33080911.

The product of its (nonzero) digits is 6967296, while the sum is 56.

The spelling of 664687631801 in words is "six hundred sixty-four billion, six hundred eighty-seven million, six hundred thirty-one thousand, eight hundred one".