1636500138012 has 36 divisors (see below), whose sum is σ = 4136783303016. Its totient is φ = 545490205920.

The previous prime is 1636500138001. The next prime is 1636500138043. The reversal of 1636500138012 is 2108310056361.

1636500138012 is a `hidden beast` number, since 1 + 6 + 3 + 6 + 500 + 138 + 0 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1772587 + ... + 2532797.

It is an arithmetic number, because the mean of its divisors is an integer number (114910647306).

Almost surely, 2^{1636500138012} is an apocalyptic number.

1636500138012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1636500138012 is an abundant number, since it is smaller than the sum of its proper divisors (2500283165004).

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

1636500138012 is a wasteful number, since it uses less digits than its factorization.

1636500138012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 820018 (or 820013 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 1636500138012 in words is "one trillion, six hundred thirty-six billion, five hundred million, one hundred thirty-eight thousand, twelve".