636406339216 has 40 divisors (see below), whose sum is σ = 1234968923448. Its totient is φ = 317705088000.

The previous prime is 636406339211. The next prime is 636406339229. The reversal of 636406339216 is 612933604636.

It can be written as a sum of positive squares in 4 ways, for example, as 77506560000 + 558899779216 = 278400^2 + 747596^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 636406339216.

It is not an unprimeable number, because it can be changed into a prime (636406339211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27973606 + ... + 27996346.

Almost surely, 2^636406339216 is an apocalyptic number.

It is an amenable number.

636406339216 is a deficient number, since it is larger than the sum of its proper divisors (598562584232).

636406339216 is a wasteful number, since it uses less digits than its factorization.

636406339216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25411 (or 25405 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 49.

The spelling of 636406339216 in words is "six hundred thirty-six billion, four hundred six million, three hundred thirty-nine thousand, two hundred sixteen".