55187555578155 has 384 divisors, whose sum is σ = 136636490704896. Its totient is φ = 19831014604800.

The previous prime is 55187555578091. The next prime is 55187555578187.

55187555578155 is a `hidden beast` number, since 5 + 5 + 1 + 8 + 7 + 55 + 557 + 8 + 15 + 5 = 666.

55187555578155 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 55187555578155 - 2⁶ = 55187555578091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 161405637 + ... + 161747193.

It is an arithmetic number, because the mean of its divisors is an integer number (355824194544).

Almost surely, 2^{55187555578155} is an apocalyptic number.

55187555578155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

55187555578155 is an abundant number, since it is smaller than the sum of its proper divisors (81448935126741).

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

55187555578155 is a wasteful number, since it uses less digits than its factorization.

55187555578155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341827 (or 341824 counting only the distinct ones).

The product of its digits is 1225000000, while the sum is 72.

The spelling of 55187555578155 in words is "fifty-five trillion, one hundred eighty-seven billion, five hundred fifty-five million, five hundred seventy-eight thousand, one hundred fifty-five".