18944637261837 has 32 divisors (see below), whose sum is σ = 29906823880704. Its totient is φ = 10438476436800.

The previous prime is 18944637261821. The next prime is 18944637261857. The reversal of 18944637261837 is 73816273644981.

It is not a de Polignac number, because 18944637261837 - 2⁴ = 18944637261821 is a prime.

It is a super-2 number, since 2×18944637261837² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18944637261857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52348239 + ... + 52708892.

It is an arithmetic number, because the mean of its divisors is an integer number (934588246272).

Almost surely, 2^{18944637261837} is an apocalyptic number.

It is an amenable number.

18944637261837 is a deficient number, since it is larger than the sum of its proper divisors (10962186618867).

18944637261837 is a wasteful number, since it uses less digits than its factorization.

18944637261837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105057449.

The product of its digits is 292626432, while the sum is 69.

The spelling of 18944637261837 in words is "eighteen trillion, nine hundred forty-four billion, six hundred thirty-seven million, two hundred sixty-one thousand, eight hundred thirty-seven".