665263039938 has 16 divisors (see below), whose sum is σ = 1520601234240. Its totient is φ = 190075154256.

The previous prime is 665263039927. The next prime is 665263039951. The reversal of 665263039938 is 839930362566.

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, 7919798053 + ... + 7919798136.

It is an arithmetic number, because the mean of its divisors is an integer number (95037577140).

Almost surely, 2^665263039938 is an apocalyptic number.

665263039938 is an abundant number, since it is smaller than the sum of its proper divisors (855338194302).

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

665263039938 is a wasteful number, since it uses less digits than its factorization.

665263039938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15839596201.

The product of its (nonzero) digits is 37791360, while the sum is 60.

The spelling of 665263039938 in words is "six hundred sixty-five billion, two hundred sixty-three million, thirty-nine thousand, nine hundred thirty-eight".