18618371772 has 96 divisors (see below), whose sum is σ = 58328922624. Its totient is φ = 4463942400.

The previous prime is 18618371771. The next prime is 18618371777. The reversal of 18618371772 is 27717381681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18618371771) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 762979 + ... + 787002.

It is an arithmetic number, because the mean of its divisors is an integer number (607592944).

Almost surely, 2^18618371772 is an apocalyptic number.

18618371772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18618371772 is an abundant number, since it is smaller than the sum of its proper divisors (39710550852).

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

18618371772 is a wasteful number, since it uses less digits than its factorization.

18618371772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550019 (or 1550017 counting only the distinct ones).

The product of its digits is 790272, while the sum is 51.

Subtracting 18618371772 from its reverse (27717381681), we obtain a palindrome (9099009909).

The spelling of 18618371772 in words is "eighteen billion, six hundred eighteen million, three hundred seventy-one thousand, seven hundred seventy-two".