18700168513 has 8 divisors (see below), whose sum is σ = 20833079400. Its totient is φ = 16666462848.

The previous prime is 18700168493. The next prime is 18700168547. The reversal of 18700168513 is 31586100781.

It can be written as a sum of positive squares in 4 ways, for example, as 970447104 + 17729721409 = 31152^2 + 133153^2 .

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 18700168513 - 2⁵ = 18700168481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18700168573) 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, 24800908 + ... + 24801661.

It is an arithmetic number, because the mean of its divisors is an integer number (2604134925).

Almost surely, 2^18700168513 is an apocalyptic number.

18700168513 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18700168513 is a deficient number, since it is larger than the sum of its proper divisors (2132910887).

18700168513 is a wasteful number, since it uses less digits than its factorization.

18700168513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49602611.

The product of its (nonzero) digits is 40320, while the sum is 40.

The spelling of 18700168513 in words is "eighteen billion, seven hundred million, one hundred sixty-eight thousand, five hundred thirteen".