664785420716 has 24 divisors (see below), whose sum is σ = 1231842689280. Its totient is φ = 312831459072.

The previous prime is 664785420703. The next prime is 664785420787. The reversal of 664785420716 is 617024587466.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2766005 + ... + 2996723.

It is an arithmetic number, because the mean of its divisors is an integer number (51326778720).

Almost surely, 2^664785420716 is an apocalyptic number.

It is an amenable number.

664785420716 is a deficient number, since it is larger than the sum of its proper divisors (567057268564).

664785420716 is a wasteful number, since it uses less digits than its factorization.

664785420716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273113 (or 273111 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 56.

The spelling of 664785420716 in words is "six hundred sixty-four billion, seven hundred eighty-five million, four hundred twenty thousand, seven hundred sixteen".