18440551479 has 32 divisors (see below), whose sum is σ = 29587847680. Its totient is φ = 9979811712.

The previous prime is 18440551453. The next prime is 18440551483. The reversal of 18440551479 is 97415504481.

It is not a de Polignac number, because 18440551479 - 2⁹ = 18440550967 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 (18440551429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2069157 + ... + 2078049.

It is an arithmetic number, because the mean of its divisors is an integer number (924620240).

Almost surely, 2^18440551479 is an apocalyptic number.

18440551479 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18440551479 is a deficient number, since it is larger than the sum of its proper divisors (11147296201).

18440551479 is a wasteful number, since it uses less digits than its factorization.

18440551479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14119.

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 18440551479 in words is "eighteen billion, four hundred forty million, five hundred fifty-one thousand, four hundred seventy-nine".