55156871025 has 135 divisors (see below), whose sum is σ = 108887775249. Its totient is φ = 27596401920.

The previous prime is 55156871023. The next prime is 55156871051. The reversal of 55156871025 is 52017865155.

The square root of 55156871025 is 234855.

It is a perfect power (a square), and thus also a powerful number.

55156871025 is a `hidden beast` number, since 5 + 51 + 568 + 7 + 10 + 25 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1290174561 + 53866696464 = 35919^2 + 232092^2 .

It is a tau number, because it is divible by the number of its divisors (135).

It is not a de Polignac number, because 55156871025 - 2¹ = 55156871023 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (55156871023) by changing a digit.

It is a polite number, since it can be written in 134 ways as a sum of consecutive naturals, for example, 179663922 + ... + 179664228.

Almost surely, 2^55156871025 is an apocalyptic number.

55156871025 is the 234855-th square number.

55156871025 is the 117428-th centered octagonal number.

It is an amenable number.

55156871025 is a deficient number, since it is larger than the sum of its proper divisors (53730904224).

55156871025 is an equidigital number, since it uses as much as digits as its factorization.

55156871025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 332 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 45.

The spelling of 55156871025 in words is "fifty-five billion, one hundred fifty-six million, eight hundred seventy-one thousand, twenty-five".