636980268027937 has 4 divisors (see below), whose sum is σ = 637021963419796. Its totient is φ = 636938572636080.

The previous prime is 636980268027853. The next prime is 636980268027941. The reversal of 636980268027937 is 739720862089636.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 88519044303936 + 548461223724001 = 9408456^2 + 23419249^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636980268027937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (636980268027967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20847673014 + ... + 20847703567.

It is an arithmetic number, because the mean of its divisors is an integer number (159255490854949).

Almost surely, 2^{636980268027937} is an apocalyptic number.

It is an amenable number.

636980268027937 is a deficient number, since it is larger than the sum of its proper divisors (41695391859).

636980268027937 is a wasteful number, since it uses less digits than its factorization.

636980268027937 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41695391858.

The product of its (nonzero) digits is 1975228416, while the sum is 76.

The spelling of 636980268027937 in words is "six hundred thirty-six trillion, nine hundred eighty billion, two hundred sixty-eight million, twenty-seven thousand, nine hundred thirty-seven".