635668375616 has 56 divisors (see below), whose sum is σ = 1298449584960. Its totient is φ = 308539141632.

The previous prime is 635668375607. The next prime is 635668375621. The reversal of 635668375616 is 616573866536.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 733811 + ... + 1345293.

Almost surely, 2^635668375616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 635668375616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (649224792480).

635668375616 is an abundant number, since it is smaller than the sum of its proper divisors (662781209344).

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

635668375616 is a wasteful number, since it uses less digits than its factorization.

635668375616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611971 (or 611961 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 62.

The spelling of 635668375616 in words is "six hundred thirty-five billion, six hundred sixty-eight million, three hundred seventy-five thousand, six hundred sixteen".