18397493055 has 24 divisors (see below), whose sum is σ = 31892293680. Its totient is φ = 9810979200.

The previous prime is 18397493053. The next prime is 18397493119. The reversal of 18397493055 is 55039479381.

18397493055 is a `hidden beast` number, since 18 + 3 + 97 + 493 + 0 + 55 = 666.

It is not a de Polignac number, because 18397493055 - 2¹ = 18397493053 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18397492992 and 18397493010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18397493053) 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 23 ways as a sum of consecutive naturals, for example, 654531 + ... + 682059.

It is an arithmetic number, because the mean of its divisors is an integer number (1328845570).

Almost surely, 2^18397493055 is an apocalyptic number.

18397493055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18397493055 is a deficient number, since it is larger than the sum of its proper divisors (13494800625).

18397493055 is a wasteful number, since it uses less digits than its factorization.

18397493055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42391 (or 42388 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 18397493055 in words is "eighteen billion, three hundred ninety-seven million, four hundred ninety-three thousand, fifty-five".