18664808120857 has 8 divisors (see below), whose sum is σ = 20147918811840. Its totient is φ = 17237663871120.

The previous prime is 18664808120821. The next prime is 18664808120947. The reversal of 18664808120857 is 75802180846681.

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 18664808120857 - 2⁷ = 18664808120729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18664808120557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13991609619 + ... + 13991610952.

It is an arithmetic number, because the mean of its divisors is an integer number (2518489851480).

Almost surely, 2^{18664808120857} is an apocalyptic number.

It is an amenable number.

18664808120857 is a deficient number, since it is larger than the sum of its proper divisors (1483110690983).

18664808120857 is a wasteful number, since it uses less digits than its factorization.

18664808120857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27983220623.

The product of its (nonzero) digits is 41287680, while the sum is 64.

The spelling of 18664808120857 in words is "eighteen trillion, six hundred sixty-four billion, eight hundred eight million, one hundred twenty thousand, eight hundred fifty-seven".