18976261666 has 8 divisors (see below), whose sum is σ = 29962518480. Its totient is φ = 8988755508.

The previous prime is 18976261649. The next prime is 18976261699. The reversal of 18976261666 is 66616267981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18976261666.

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, 249687616 + ... + 249687691.

It is an arithmetic number, because the mean of its divisors is an integer number (3745314810).

Almost surely, 2^18976261666 is an apocalyptic number.

18976261666 is a deficient number, since it is larger than the sum of its proper divisors (10986256814).

18976261666 is a wasteful number, since it uses less digits than its factorization.

18976261666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499375328.

The product of its digits is 7838208, while the sum is 58.

The spelling of 18976261666 in words is "eighteen billion, nine hundred seventy-six million, two hundred sixty-one thousand, six hundred sixty-six".