18578061572 has 24 divisors (see below), whose sum is σ = 37213060416. Its totient is φ = 7949825568.

The previous prime is 18578061563. The next prime is 18578061583. The reversal of 18578061572 is 27516087581.

It is a super-2 number, since 2×18578061572² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18578061572.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 489758 + ... + 526325.

It is an arithmetic number, because the mean of its divisors is an integer number (1550544184).

Almost surely, 2^18578061572 is an apocalyptic number.

It is an amenable number.

18578061572 is an abundant number, since it is smaller than the sum of its proper divisors (18634998844).

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

18578061572 is a wasteful number, since it uses less digits than its factorization.

18578061572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016747 (or 1016745 counting only the distinct ones).

The product of its (nonzero) digits is 940800, while the sum is 50.

The spelling of 18578061572 in words is "eighteen billion, five hundred seventy-eight million, sixty-one thousand, five hundred seventy-two".