261167506831 has 24 divisors (see below), whose sum is σ = 339509514960. Its totient is φ = 198543542400.

The previous prime is 261167506811. The next prime is 261167506837. The reversal of 261167506831 is 138605761162.

It is a happy number.

It is not a de Polignac number, because 261167506831 - 2¹³ = 261167498639 is a prime.

It is a super-2 number, since 2×261167506831² (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 (261167506837) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5886936 + ... + 5931133.

It is an arithmetic number, because the mean of its divisors is an integer number (14146229790).

Almost surely, 2^261167506831 is an apocalyptic number.

261167506831 is a deficient number, since it is larger than the sum of its proper divisors (78342008129).

261167506831 is a wasteful number, since it uses less digits than its factorization.

261167506831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11818135 (or 11818128 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 261167506831 in words is "two hundred sixty-one billion, one hundred sixty-seven million, five hundred six thousand, eight hundred thirty-one".