18906549772 has 24 divisors (see below), whose sum is σ = 36933728832. Its totient is φ = 8394027600.

The previous prime is 18906549737. The next prime is 18906549803. The reversal of 18906549772 is 27794560981.

It is a super-2 number, since 2×18906549772² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

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, 4994554 + ... + 4998337.

It is an arithmetic number, because the mean of its divisors is an integer number (1538905368).

Almost surely, 2^18906549772 is an apocalyptic number.

It is an amenable number.

18906549772 is a deficient number, since it is larger than the sum of its proper divisors (18027179060).

18906549772 is a wasteful number, since it uses less digits than its factorization.

18906549772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9992949 (or 9992947 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 58.

The spelling of 18906549772 in words is "eighteen billion, nine hundred six million, five hundred forty-nine thousand, seven hundred seventy-two".