18240167772 has 36 divisors (see below), whose sum is σ = 47088097056. Its totient is φ = 5950692480.

The previous prime is 18240167767. The next prime is 18240167773. The reversal of 18240167772 is 27776104281.

18240167772 is a `hidden beast` number, since 182 + 401 + 67 + 7 + 7 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18240167773) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5388429 + ... + 5391812.

It is an arithmetic number, because the mean of its divisors is an integer number (1308002696).

Almost surely, 2^18240167772 is an apocalyptic number.

18240167772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18240167772 is an abundant number, since it is smaller than the sum of its proper divisors (28847929284).

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

18240167772 is a wasteful number, since it uses less digits than its factorization.

18240167772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10780298 (or 10780293 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The spelling of 18240167772 in words is "eighteen billion, two hundred forty million, one hundred sixty-seven thousand, seven hundred seventy-two".