636138455039 has 4 divisors (see below), whose sum is σ = 636261053880. Its totient is φ = 636015856200.

The previous prime is 636138455033. The next prime is 636138455059. The reversal of 636138455039 is 930554831636.

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

It is a cyclic number.

It is not a de Polignac number, because 636138455039 - 2¹⁶ = 636138389503 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 (636138455033) 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, 61291637 + ... + 61302014.

It is an arithmetic number, because the mean of its divisors is an integer number (159065263470).

Almost surely, 2^636138455039 is an apocalyptic number.

636138455039 is a deficient number, since it is larger than the sum of its proper divisors (122598841).

636138455039 is a wasteful number, since it uses less digits than its factorization.

636138455039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122598840.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 636138455039 in words is "six hundred thirty-six billion, one hundred thirty-eight million, four hundred fifty-five thousand, thirty-nine".