261422572214365 has 4 divisors (see below), whose sum is σ = 313707086657244. Its totient is φ = 209138057771488.

The previous prime is 261422572214359. The next prime is 261422572214491. The reversal of 261422572214365 is 563412275224162.

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 70842421238436 + 190580150975929 = 8416794^2 + 13805077^2 .

It is a cyclic number.

It is not a de Polignac number, because 261422572214365 - 2²³ = 261422563825757 is a prime.

It is a super-2 number, since 2×261422572214365² (a number of 30 digits) contains 22 as substring.

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, 26142257221432 + ... + 26142257221441.

It is an arithmetic number, because the mean of its divisors is an integer number (78426771664311).

Almost surely, 2^{261422572214365} is an apocalyptic number.

It is an amenable number.

261422572214365 is a deficient number, since it is larger than the sum of its proper divisors (52284514442879).

261422572214365 is an equidigital number, since it uses as much as digits as its factorization.

261422572214365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52284514442878.

The product of its digits is 9676800, while the sum is 52.

The spelling of 261422572214365 in words is "two hundred sixty-one trillion, four hundred twenty-two billion, five hundred seventy-two million, two hundred fourteen thousand, three hundred sixty-five".