18621219156 has 24 divisors (see below), whose sum is σ = 44185945440. Its totient is φ = 6101868192.

The previous prime is 18621219151. The next prime is 18621219167. The reversal of 18621219156 is 65191212681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18621219151) 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, 13149871 + ... + 13151286.

It is an arithmetic number, because the mean of its divisors is an integer number (1841081060).

Almost surely, 2^18621219156 is an apocalyptic number.

It is an amenable number.

18621219156 is an abundant number, since it is smaller than the sum of its proper divisors (25564726284).

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

18621219156 is a wasteful number, since it uses less digits than its factorization.

18621219156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26301223 (or 26301221 counting only the distinct ones).

The product of its digits is 51840, while the sum is 42.

The spelling of 18621219156 in words is "eighteen billion, six hundred twenty-one million, two hundred nineteen thousand, one hundred fifty-six".