18037422991 has 16 divisors (see below), whose sum is σ = 20732963328. Its totient is φ = 15371820000.

The previous prime is 18037422961. The next prime is 18037423013. The reversal of 18037422991 is 19922473081.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18037422991 - 2⁵ = 18037422959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18037422901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 903366 + ... + 923116.

It is an arithmetic number, because the mean of its divisors is an integer number (1295810208).

Almost surely, 2^18037422991 is an apocalyptic number.

18037422991 is a deficient number, since it is larger than the sum of its proper divisors (2695540337).

18037422991 is a wasteful number, since it uses less digits than its factorization.

18037422991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20502.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 18037422991 in words is "eighteen billion, thirty-seven million, four hundred twenty-two thousand, nine hundred ninety-one".