122556056261 has 4 divisors (see below), whose sum is σ = 122564469132. Its totient is φ = 122547643392.

The previous prime is 122556056213. The next prime is 122556056279. The reversal of 122556056261 is 162650655221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162650655221 = 60149 ⋅2704129.

It can be written as a sum of positive squares in 2 ways, for example, as 38418352036 + 84137704225 = 196006^2 + 290065^2 .

It is a cyclic number.

It is not a de Polignac number, because 122556056261 - 2¹⁸ = 122555794117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122556056201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4184546 + ... + 4213731.

It is an arithmetic number, because the mean of its divisors is an integer number (30641117283).

Almost surely, 2^122556056261 is an apocalyptic number.

It is an amenable number.

122556056261 is a deficient number, since it is larger than the sum of its proper divisors (8412871).

122556056261 is an equidigital number, since it uses as much as digits as its factorization.

122556056261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8412870.

The product of its (nonzero) digits is 216000, while the sum is 41.

It can be divided in two parts, 1225560 and 56261, that added together give a palindrome (1281821).

The spelling of 122556056261 in words is "one hundred twenty-two billion, five hundred fifty-six million, fifty-six thousand, two hundred sixty-one".