636850664064 has 128 divisors (see below), whose sum is σ = 1907648308800. Its totient is φ = 209115067392.

The previous prime is 636850664059. The next prime is 636850664077. The reversal of 636850664064 is 460466058636.

It is a happy number.

636850664064 is a `hidden beast` number, since 6 + 36 + 8 + 506 + 6 + 40 + 64 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 636850664064.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1143627 + ... + 1606730.

Almost surely, 2^636850664064 is an apocalyptic number.

636850664064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

636850664064 is an abundant number, since it is smaller than the sum of its proper divisors (1270797644736).

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

636850664064 is a wasteful number, since it uses less digits than its factorization.

636850664064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2750447 (or 2750429 counting only the distinct ones).

The product of its (nonzero) digits is 14929920, while the sum is 54.

The spelling of 636850664064 in words is "six hundred thirty-six billion, eight hundred fifty million, six hundred sixty-four thousand, sixty-four".