665189316640 has 48 divisors (see below), whose sum is σ = 1577770850880. Its totient is φ = 265015648000.

The previous prime is 665189316607. The next prime is 665189316653. The reversal of 665189316640 is 46613981566.

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, 8241580 + ... + 8321899.

It is an arithmetic number, because the mean of its divisors is an integer number (32870226060).

Almost surely, 2^665189316640 is an apocalyptic number.

It is an amenable number.

665189316640 is an abundant number, since it is smaller than the sum of its proper divisors (912581534240).

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

665189316640 is a wasteful number, since it uses less digits than its factorization.

665189316640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16563745 (or 16563737 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 55.

The spelling of 665189316640 in words is "six hundred sixty-five billion, one hundred eighty-nine million, three hundred sixteen thousand, six hundred forty".