18455899553 has 16 divisors (see below), whose sum is σ = 22721172096. Its totient is φ = 14598472320.

The previous prime is 18455899547. The next prime is 18455899559. The reversal of 18455899553 is 35599855481.

It is an interprime number because it is at equal distance from previous prime (18455899547) and next prime (18455899559).

It is a cyclic number.

It is not a de Polignac number, because 18455899553 - 2¹² = 18455895457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18455899559) 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, 331925 + ... + 383517.

It is an arithmetic number, because the mean of its divisors is an integer number (1420073256).

Almost surely, 2^18455899553 is an apocalyptic number.

18455899553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18455899553 is a deficient number, since it is larger than the sum of its proper divisors (4265272543).

18455899553 is a wasteful number, since it uses less digits than its factorization.

18455899553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55544.

The product of its digits is 38880000, while the sum is 62.

The spelling of 18455899553 in words is "eighteen billion, four hundred fifty-five million, eight hundred ninety-nine thousand, five hundred fifty-three".