664013693 has 24 divisors (see below), whose sum is σ = 813030336. Its totient is φ = 529401600.

The previous prime is 664013681. The next prime is 664013699. The reversal of 664013693 is 396310466.

It is not a de Polignac number, because 664013693 - 2⁶ = 664013629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664013699) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1213646 + ... + 1214192.

It is an arithmetic number, because the mean of its divisors is an integer number (33876264).

Almost surely, 2^664013693 is an apocalyptic number.

It is an amenable number.

664013693 is a deficient number, since it is larger than the sum of its proper divisors (149016643).

664013693 is a wasteful number, since it uses less digits than its factorization.

664013693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 664013693 is about 25768.4631478092. The cubic root of 664013693 is about 872.4201312210.

The spelling of 664013693 in words is "six hundred sixty-four million, thirteen thousand, six hundred ninety-three".