18018363813 has 16 divisors (see below), whose sum is σ = 24271742976. Its totient is φ = 11888748720.

The previous prime is 18018363809. The next prime is 18018363817. The reversal of 18018363813 is 31836381081.

It is an interprime number because it is at equal distance from previous prime (18018363809) and next prime (18018363817).

It is not a de Polignac number, because 18018363813 - 2² = 18018363809 is a prime.

It is a super-2 number, since 2×18018363813² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18018363817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 549856 + ... + 581702.

It is an arithmetic number, because the mean of its divisors is an integer number (1516983936).

Almost surely, 2^18018363813 is an apocalyptic number.

It is an amenable number.

18018363813 is a deficient number, since it is larger than the sum of its proper divisors (6253379163).

18018363813 is a wasteful number, since it uses less digits than its factorization.

18018363813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33784.

The product of its (nonzero) digits is 82944, while the sum is 42.

The spelling of 18018363813 in words is "eighteen billion, eighteen million, three hundred sixty-three thousand, eight hundred thirteen".