18013911551 has 16 divisors (see below), whose sum is σ = 18671385600. Its totient is φ = 17361379200.

The previous prime is 18013911547. The next prime is 18013911593. The reversal of 18013911551 is 15511931081.

It is a cyclic number.

It is not a de Polignac number, because 18013911551 - 2² = 18013911547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18013911541) 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, 13235111 + ... + 13236471.

It is an arithmetic number, because the mean of its divisors is an integer number (1166961600).

Almost surely, 2^18013911551 is an apocalyptic number.

18013911551 is a deficient number, since it is larger than the sum of its proper divisors (657474049).

18013911551 is a wasteful number, since it uses less digits than its factorization.

18013911551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2830.

The product of its (nonzero) digits is 5400, while the sum is 35.

The spelling of 18013911551 in words is "eighteen billion, thirteen million, nine hundred eleven thousand, five hundred fifty-one".