636120427155 has 16 divisors (see below), whose sum is σ = 1017804675744. Its totient is φ = 339260230400.

The previous prime is 636120427153. The next prime is 636120427181. The reversal of 636120427155 is 551724021636.

It is not a de Polignac number, because 636120427155 - 2¹ = 636120427153 is a prime.

It is a super-2 number, since 2×636120427155² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (636120427153) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1430005 + ... + 1821305.

It is an arithmetic number, because the mean of its divisors is an integer number (63612792234).

Almost surely, 2^636120427155 is an apocalyptic number.

636120427155 is a deficient number, since it is larger than the sum of its proper divisors (381684248589).

636120427155 is a wasteful number, since it uses less digits than its factorization.

636120427155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499686.

The product of its (nonzero) digits is 302400, while the sum is 42.

The spelling of 636120427155 in words is "six hundred thirty-six billion, one hundred twenty million, four hundred twenty-seven thousand, one hundred fifty-five".