171216457155 has 128 divisors (see below), whose sum is σ = 317123923200. Its totient is φ = 87572938752.

The previous prime is 171216457141. The next prime is 171216457169. The reversal of 171216457155 is 551754612171.

171216457155 is a `hidden beast` number, since 1 + 7 + 1 + 21 + 6 + 4 + 571 + 55 = 666.

It is an interprime number because it is at equal distance from previous prime (171216457141) and next prime (171216457169).

It is not a de Polignac number, because 171216457155 - 2⁹ = 171216456643 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 171216457155.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 151652631 + ... + 151653759.

It is an arithmetic number, because the mean of its divisors is an integer number (2477530650).

Almost surely, 2^171216457155 is an apocalyptic number.

171216457155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

171216457155 is a deficient number, since it is larger than the sum of its proper divisors (145907466045).

171216457155 is a wasteful number, since it uses less digits than its factorization.

171216457155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1590 (or 1584 counting only the distinct ones).

The product of its digits is 294000, while the sum is 45.

The spelling of 171216457155 in words is "one hundred seventy-one billion, two hundred sixteen million, four hundred fifty-seven thousand, one hundred fifty-five".