261868725831 has 8 divisors (see below), whose sum is σ = 349240880880. Its totient is φ = 174537860672.

The previous prime is 261868725829. The next prime is 261868725851. The reversal of 261868725831 is 138527868162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261868725831 - 2¹ = 261868725829 is a prime.

It is a super-2 number, since 2×261868725831² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261868725851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10307670 + ... + 10333043.

It is an arithmetic number, because the mean of its divisors is an integer number (43655110110).

Almost surely, 2^261868725831 is an apocalyptic number.

261868725831 is a deficient number, since it is larger than the sum of its proper divisors (87372155049).

261868725831 is a wasteful number, since it uses less digits than its factorization.

261868725831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20644945.

The product of its digits is 7741440, while the sum is 57.

The spelling of 261868725831 in words is "two hundred sixty-one billion, eight hundred sixty-eight million, seven hundred twenty-five thousand, eight hundred thirty-one".