636084648421 has 4 divisors (see below), whose sum is σ = 636104804832. Its totient is φ = 636064492012.

The previous prime is 636084648413. The next prime is 636084648427. The reversal of 636084648421 is 124846480636.

636084648421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 636084648421 - 2³ = 636084648413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636084648427) 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, 10030795 + ... + 10094008.

It is an arithmetic number, because the mean of its divisors is an integer number (159026201208).

Almost surely, 2^636084648421 is an apocalyptic number.

It is an amenable number.

636084648421 is a deficient number, since it is larger than the sum of its proper divisors (20156411).

636084648421 is a wasteful number, since it uses less digits than its factorization.

636084648421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20156410.

The product of its (nonzero) digits is 5308416, while the sum is 52.

The spelling of 636084648421 in words is "six hundred thirty-six billion, eighty-four million, six hundred forty-eight thousand, four hundred twenty-one".