261552455323061 has 4 divisors (see below), whose sum is σ = 298917091797792. Its totient is φ = 224187818848332.

The previous prime is 261552455322997. The next prime is 261552455323073. The reversal of 261552455323061 is 160323554255162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261552455323061 - 2⁶ = 261552455322997 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 (261552455323261) 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, 18682318237355 + ... + 18682318237368.

It is an arithmetic number, because the mean of its divisors is an integer number (74729272949448).

Almost surely, 2^{261552455323061} is an apocalyptic number.

It is an amenable number.

261552455323061 is a deficient number, since it is larger than the sum of its proper divisors (37364636474731).

261552455323061 is an equidigital number, since it uses as much as digits as its factorization.

261552455323061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37364636474730.

The product of its (nonzero) digits is 6480000, while the sum is 50.

The spelling of 261552455323061 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, four hundred fifty-five million, three hundred twenty-three thousand, sixty-one".