665377835838 has 16 divisors (see below), whose sum is σ = 1331012686080. Its totient is φ = 221749776216.

The previous prime is 665377835827. The next prime is 665377835839. The reversal of 665377835838 is 838538773566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665377835839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10675270 + ... + 10737417.

It is an arithmetic number, because the mean of its divisors is an integer number (83188292880).

Almost surely, 2^665377835838 is an apocalyptic number.

665377835838 is an abundant number, since it is smaller than the sum of its proper divisors (665634850242).

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

665377835838 is a wasteful number, since it uses less digits than its factorization.

665377835838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21417871.

The product of its digits is 609638400, while the sum is 69.

The spelling of 665377835838 in words is "six hundred sixty-five billion, three hundred seventy-seven million, eight hundred thirty-five thousand, eight hundred thirty-eight".