261534370412742 has 64 divisors (see below), whose sum is σ = 602735035161600. Its totient is φ = 74107882532736.

The previous prime is 261534370412677. The next prime is 261534370412779. The reversal of 261534370412742 is 247214073435162.

It is a happy number.

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, 28247833 + ... + 36345684.

It is an arithmetic number, because the mean of its divisors is an integer number (9417734924400).

Almost surely, 2^{261534370412742} is an apocalyptic number.

261534370412742 is an abundant number, since it is smaller than the sum of its proper divisors (341200664748858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261534370412742 is a wasteful number, since it uses less digits than its factorization.

261534370412742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64594325.

The product of its (nonzero) digits is 6773760, while the sum is 51.

The spelling of 261534370412742 in words is "two hundred sixty-one trillion, five hundred thirty-four billion, three hundred seventy million, four hundred twelve thousand, seven hundred forty-two".