636080862421 has 4 divisors (see below), whose sum is σ = 642378692844. Its totient is φ = 629783032000.

The previous prime is 636080862397. The next prime is 636080862449. The reversal of 636080862421 is 124268080636.

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 457937777521 + 178143084900 = 676711^2 + 422070^2 .

It is a cyclic number.

It is not a de Polignac number, because 636080862421 - 2¹⁵ = 636080829653 is a prime.

It is a super-3 number, since 3×636080862421³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636080862121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3148915060 + ... + 3148915261.

It is an arithmetic number, because the mean of its divisors is an integer number (160594673211).

Almost surely, 2^636080862421 is an apocalyptic number.

It is an amenable number.

636080862421 is a deficient number, since it is larger than the sum of its proper divisors (6297830423).

636080862421 is a wasteful number, since it uses less digits than its factorization.

636080862421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6297830422.

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 636080862421 in words is "six hundred thirty-six billion, eighty million, eight hundred sixty-two thousand, four hundred twenty-one".