659666431968 has 48 divisors (see below), whose sum is σ = 1806912406656. Its totient is φ = 210328426880.

The previous prime is 659666431901. The next prime is 659666431969. The reversal of 659666431968 is 869134666956.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659666431969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149378778 + ... + 149383193.

It is an arithmetic number, because the mean of its divisors is an integer number (37644008472).

Almost surely, 2^659666431968 is an apocalyptic number.

It is an amenable number.

659666431968 is an abundant number, since it is smaller than the sum of its proper divisors (1147245974688).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

659666431968 is a wasteful number, since it uses less digits than its factorization.

659666431968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298762007 (or 298761999 counting only the distinct ones).

The product of its digits is 302330880, while the sum is 69.

The spelling of 659666431968 in words is "six hundred fifty-nine billion, six hundred sixty-six million, four hundred thirty-one thousand, nine hundred sixty-eight".