18849951564 has 12 divisors (see below), whose sum is σ = 43983220344. Its totient is φ = 6283317184.

The previous prime is 18849951521. The next prime is 18849951583. The reversal of 18849951564 is 46515994881.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-3 number, since 3×18849951564³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18849951498 and 18849951507.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785414637 + ... + 785414660.

It is an arithmetic number, because the mean of its divisors is an integer number (3665268362).

Almost surely, 2^18849951564 is an apocalyptic number.

It is an amenable number.

18849951564 is an abundant number, since it is smaller than the sum of its proper divisors (25133268780).

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

18849951564 is a wasteful number, since it uses less digits than its factorization.

18849951564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1570829304 (or 1570829302 counting only the distinct ones).

The product of its digits is 12441600, while the sum is 60.

The spelling of 18849951564 in words is "eighteen billion, eight hundred forty-nine million, nine hundred fifty-one thousand, five hundred sixty-four".