636666321354 has 32 divisors (see below), whose sum is σ = 1464874653696. Its totient is φ = 180699994800.

The previous prime is 636666321337. The next prime is 636666321359. The reversal of 636666321354 is 453123666636.

It is a junction number, because it is equal to n+sod(n) for n = 636666321297 and 636666321306.

It is not an unprimeable number, because it can be changed into a prime (636666321359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50188102 + ... + 50200785.

It is an arithmetic number, because the mean of its divisors is an integer number (45777332928).

Almost surely, 2^636666321354 is an apocalyptic number.

636666321354 is an abundant number, since it is smaller than the sum of its proper divisors (828208332342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

636666321354 is a wasteful number, since it uses less digits than its factorization.

636666321354 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100389050.

The product of its digits is 8398080, while the sum is 51.

The spelling of 636666321354 in words is "six hundred thirty-six billion, six hundred sixty-six million, three hundred twenty-one thousand, three hundred fifty-four".