18240386572 has 12 divisors (see below), whose sum is σ = 33798363480. Its totient is φ = 8583711296.

The previous prime is 18240386543. The next prime is 18240386573. The reversal of 18240386572 is 27568304281.

It is a super-2 number, since 2×18240386572² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18240386573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134120422 + ... + 134120557.

It is an arithmetic number, because the mean of its divisors is an integer number (2816530290).

Almost surely, 2^18240386572 is an apocalyptic number.

It is an amenable number.

18240386572 is a deficient number, since it is larger than the sum of its proper divisors (15557976908).

18240386572 is a wasteful number, since it uses less digits than its factorization.

18240386572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268241000 (or 268240998 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 18240386572 in words is "eighteen billion, two hundred forty million, three hundred eighty-six thousand, five hundred seventy-two".