18212985637 has 16 divisors (see below), whose sum is σ = 22872857472. Its totient is φ = 14088337920.

The previous prime is 18212985541. The next prime is 18212985641. The reversal of 18212985637 is 73658921281.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18212985637 - 2¹¹ = 18212983589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18212985697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 852708 + ... + 873805.

It is an arithmetic number, because the mean of its divisors is an integer number (1429553592).

Almost surely, 2^18212985637 is an apocalyptic number.

It is an amenable number.

18212985637 is a deficient number, since it is larger than the sum of its proper divisors (4659871835).

18212985637 is a wasteful number, since it uses less digits than its factorization.

18212985637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1726668.

The product of its digits is 1451520, while the sum is 52.

The spelling of 18212985637 in words is "eighteen billion, two hundred twelve million, nine hundred eighty-five thousand, six hundred thirty-seven".