18590618915857 has 8 divisors (see below), whose sum is σ = 18598020466760. Its totient is φ = 18583218339840.

The previous prime is 18590618915837. The next prime is 18590618915909. The reversal of 18590618915857 is 75851981609581.

It is a Cunningham number, because it is equal to 4311684²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 18590618915856 = 1^2 + 4311684^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18590618915857 is a prime.

It is a super-2 number, since 2×18590618915857² (a number of 27 digits) contains 22 as substring.

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 18590618915857.

It is not an unprimeable number, because it can be changed into a prime (18590618915837) 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, 39164257 + ... + 39636097.

It is an arithmetic number, because the mean of its divisors is an integer number (2324752558345).

Almost surely, 2^{18590618915857} is an apocalyptic number.

It is an amenable number.

18590618915857 is a deficient number, since it is larger than the sum of its proper divisors (7401550903).

18590618915857 is a wasteful number, since it uses less digits than its factorization.

18590618915857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487443.

The product of its (nonzero) digits is 217728000, while the sum is 73.

The spelling of 18590618915857 in words is "eighteen trillion, five hundred ninety billion, six hundred eighteen million, nine hundred fifteen thousand, eight hundred fifty-seven".