255631432165 has 4 divisors (see below), whose sum is σ = 306757718604. Its totient is φ = 204505145728.

The previous prime is 255631432109. The next prime is 255631432183. The reversal of 255631432165 is 561234136552.

255631432165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120958579681 + 134672852484 = 347791^2 + 366978^2 .

It is a cyclic number.

It is not a de Polignac number, because 255631432165 - 2¹³ = 255631423973 is a prime.

It is a super-2 number, since 2×255631432165² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25563143212 + ... + 25563143221.

It is an arithmetic number, because the mean of its divisors is an integer number (76689429651).

Almost surely, 2^255631432165 is an apocalyptic number.

It is an amenable number.

255631432165 is a deficient number, since it is larger than the sum of its proper divisors (51126286439).

255631432165 is an equidigital number, since it uses as much as digits as its factorization.

255631432165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51126286438.

The product of its digits is 648000, while the sum is 43.

The spelling of 255631432165 in words is "two hundred fifty-five billion, six hundred thirty-one million, four hundred thirty-two thousand, one hundred sixty-five".