261126290085 has 32 divisors (see below), whose sum is σ = 442432523520. Its totient is φ = 131059196928.

The previous prime is 261126290077. The next prime is 261126290101. The reversal of 261126290085 is 580092621162.

It is not a de Polignac number, because 261126290085 - 2³ = 261126290077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2196019 + ... + 2311871.

It is an arithmetic number, because the mean of its divisors is an integer number (13826016360).

Almost surely, 2^261126290085 is an apocalyptic number.

It is an amenable number.

261126290085 is a deficient number, since it is larger than the sum of its proper divisors (181306233435).

261126290085 is a wasteful number, since it uses less digits than its factorization.

261126290085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124717.

The product of its (nonzero) digits is 103680, while the sum is 42.

The spelling of 261126290085 in words is "two hundred sixty-one billion, one hundred twenty-six million, two hundred ninety thousand, eighty-five".