261285182255 has 4 divisors (see below), whose sum is σ = 313542218712. Its totient is φ = 209028145800.

The previous prime is 261285182239. The next prime is 261285182261. The reversal of 261285182255 is 552281582162.

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

It is not a de Polignac number, because 261285182255 - 2⁴ = 261285182239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26128518221 + ... + 26128518230.

It is an arithmetic number, because the mean of its divisors is an integer number (78385554678).

Almost surely, 2^261285182255 is an apocalyptic number.

261285182255 is a deficient number, since it is larger than the sum of its proper divisors (52257036457).

261285182255 is an equidigital number, since it uses as much as digits as its factorization.

261285182255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52257036456.

The product of its digits is 768000, while the sum is 47.

The spelling of 261285182255 in words is "two hundred sixty-one billion, two hundred eighty-five million, one hundred eighty-two thousand, two hundred fifty-five".