18856973513 has 8 divisors (see below), whose sum is σ = 21748541760. Its totient is φ = 16014834000.

The previous prime is 18856973501. The next prime is 18856973587. The reversal of 18856973513 is 31537965881.

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 18856973513 - 2¹⁰ = 18856972489 is a prime.

It is a super-2 number, since 2×18856973513² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18856973413) 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, 12356363 + ... + 12357888.

It is an arithmetic number, because the mean of its divisors is an integer number (2718567720).

Almost surely, 2^18856973513 is an apocalyptic number.

It is an amenable number.

18856973513 is a deficient number, since it is larger than the sum of its proper divisors (2891568247).

18856973513 is a wasteful number, since it uses less digits than its factorization.

18856973513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24714367.

The product of its digits is 5443200, while the sum is 56.

The spelling of 18856973513 in words is "eighteen billion, eight hundred fifty-six million, nine hundred seventy-three thousand, five hundred thirteen".