18681941008 has 20 divisors (see below), whose sum is σ = 36789643948. Its totient is φ = 9187839360.

The previous prime is 18681940999. The next prime is 18681941017. The reversal of 18681941008 is 80014918681.

It is an interprime number because it is at equal distance from previous prime (18681940999) and next prime (18681941017).

It can be written as a sum of positive squares in 2 ways, for example, as 8736267024 + 9945673984 = 93468^2 + 99728^2 .

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, 9569691 + ... + 9571642.

Almost surely, 2^18681941008 is an apocalyptic number.

It is an amenable number.

18681941008 is a deficient number, since it is larger than the sum of its proper divisors (18107702940).

18681941008 is a wasteful number, since it uses less digits than its factorization.

18681941008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19141402 (or 19141396 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 46.

The spelling of 18681941008 in words is "eighteen billion, six hundred eighty-one million, nine hundred forty-one thousand, eight".