163533572055 has 32 divisors (see below), whose sum is σ = 332258688000. Its totient is φ = 74758203936.

The previous prime is 163533572051. The next prime is 163533572063. The reversal of 163533572055 is 550275335361.

163533572055 is a `hidden beast` number, since 1 + 63 + 533 + 5 + 7 + 2 + 0 + 55 = 666.

It is not a de Polignac number, because 163533572055 - 2² = 163533572051 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 163533572055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163533572051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 86524755 + ... + 86526644.

It is an arithmetic number, because the mean of its divisors is an integer number (10383084000).

Almost surely, 2^163533572055 is an apocalyptic number.

163533572055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

163533572055 is an abundant number, since it is smaller than the sum of its proper divisors (168725115945).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

163533572055 is a wasteful number, since it uses less digits than its factorization.

163533572055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173051420 (or 173051414 counting only the distinct ones).

The product of its (nonzero) digits is 1417500, while the sum is 45.

The spelling of 163533572055 in words is "one hundred sixty-three billion, five hundred thirty-three million, five hundred seventy-two thousand, fifty-five".