18862172055 has 64 divisors (see below), whose sum is σ = 33991211520. Its totient is φ = 9922687488.

The previous prime is 18862171997. The next prime is 18862172089. The reversal of 18862172055 is 55027126881.

18862172055 is a `hidden beast` number, since 18 + 8 + 621 + 7 + 2 + 0 + 5 + 5 = 666.

It is not a de Polignac number, because 18862172055 - 2⁹ = 18862171543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 18862172055.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10946424 + ... + 10948146.

It is an arithmetic number, because the mean of its divisors is an integer number (531112680).

Almost surely, 2^18862172055 is an apocalyptic number.

18862172055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18862172055 is a deficient number, since it is larger than the sum of its proper divisors (15129039465).

18862172055 is a wasteful number, since it uses less digits than its factorization.

18862172055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2797 (or 2791 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The spelling of 18862172055 in words is "eighteen billion, eight hundred sixty-two million, one hundred seventy-two thousand, fifty-five".