18889266658961 has 8 divisors (see below), whose sum is σ = 19897550354400. Its totient is φ = 17882394140160.

The previous prime is 18889266658903. The next prime is 18889266658979. The reversal of 18889266658961 is 16985666298881.

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

It is a cyclic number.

It is not a de Polignac number, because 18889266658961 - 2²⁶ = 18889199550097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18889266658961.

It is not an unprimeable number, because it can be changed into a prime (18889266658061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 352766675 + ... + 352820216.

It is an arithmetic number, because the mean of its divisors is an integer number (2487193794300).

Almost surely, 2^{18889266658961} is an apocalyptic number.

It is an amenable number.

18889266658961 is a deficient number, since it is larger than the sum of its proper divisors (1008283695439).

18889266658961 is a wasteful number, since it uses less digits than its factorization.

18889266658961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705588319.

The product of its digits is 4299816960, while the sum is 83.

The spelling of 18889266658961 in words is "eighteen trillion, eight hundred eighty-nine billion, two hundred sixty-six million, six hundred fifty-eight thousand, nine hundred sixty-one".