261266316522531 has 8 divisors (see below), whose sum is σ = 363500962118400. Its totient is φ = 166604607637512.

The previous prime is 261266316522511. The next prime is 261266316522551. The reversal of 261266316522531 is 135225613662162.

It is an interprime number because it is at equal distance from previous prime (261266316522511) and next prime (261266316522551).

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

It is not a de Polignac number, because 261266316522531 - 2¹⁸ = 261266316260387 is a prime.

It is a super-2 number, since 2×261266316522531² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261266316522511) 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, 1893234177631 + ... + 1893234177768.

It is an arithmetic number, because the mean of its divisors is an integer number (45437620264800).

Almost surely, 2^{261266316522531} is an apocalyptic number.

261266316522531 is a deficient number, since it is larger than the sum of its proper divisors (102234645595869).

261266316522531 is a wasteful number, since it uses less digits than its factorization.

261266316522531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3786468355425.

The product of its digits is 4665600, while the sum is 51.

The spelling of 261266316522531 in words is "two hundred sixty-one trillion, two hundred sixty-six billion, three hundred sixteen million, five hundred twenty-two thousand, five hundred thirty-one".