18990111151 has 16 divisors (see below), whose sum is σ = 21436410240. Its totient is φ = 16664109280.

The previous prime is 18990111143. The next prime is 18990111167. The reversal of 18990111151 is 15111109981.

It is a cyclic number.

It is not a de Polignac number, because 18990111151 - 2³ = 18990111143 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18990111151.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18990111191) 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, 2326860 + ... + 2335006.

It is an arithmetic number, because the mean of its divisors is an integer number (1339775640).

Almost surely, 2^18990111151 is an apocalyptic number.

18990111151 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18990111151 is a deficient number, since it is larger than the sum of its proper divisors (2446299089).

18990111151 is a wasteful number, since it uses less digits than its factorization.

18990111151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15494.

The product of its (nonzero) digits is 3240, while the sum is 37.

The spelling of 18990111151 in words is "eighteen billion, nine hundred ninety million, one hundred eleven thousand, one hundred fifty-one".