261451126352 has 20 divisors (see below), whose sum is σ = 545527831380. Its totient is φ = 120669750528.

The previous prime is 261451126327. The next prime is 261451126361. The reversal of 261451126352 is 253621154162.

It can be written as a sum of positive squares in 2 ways, for example, as 71665431616 + 189785694736 = 267704^2 + 435644^2 .

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, 628488077 + ... + 628488492.

It is an arithmetic number, because the mean of its divisors is an integer number (27276391569).

Almost surely, 2^261451126352 is an apocalyptic number.

It is an amenable number.

261451126352 is an abundant number, since it is smaller than the sum of its proper divisors (284076705028).

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

261451126352 is a wasteful number, since it uses less digits than its factorization.

261451126352 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256976590 (or 1256976584 counting only the distinct ones).

The product of its digits is 86400, while the sum is 38.

The spelling of 261451126352 in words is "two hundred sixty-one billion, four hundred fifty-one million, one hundred twenty-six thousand, three hundred fifty-two".