18927444668 has 12 divisors (see below), whose sum is σ = 36134212632. Its totient is φ = 8603383920.

The previous prime is 18927444659. The next prime is 18927444677. The reversal of 18927444668 is 86644472981.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18927444659) and next prime (18927444677).

It is a congruent number.

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, 215084555 + ... + 215084642.

It is an arithmetic number, because the mean of its divisors is an integer number (3011184386).

Almost surely, 2^18927444668 is an apocalyptic number.

It is an amenable number.

18927444668 is a deficient number, since it is larger than the sum of its proper divisors (17206767964).

18927444668 is a wasteful number, since it uses less digits than its factorization.

18927444668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430169212 (or 430169210 counting only the distinct ones).

The product of its digits is 18579456, while the sum is 59.

The spelling of 18927444668 in words is "eighteen billion, nine hundred twenty-seven million, four hundred forty-four thousand, six hundred sixty-eight".