261196394360831 has 6 divisors (see below), whose sum is σ = 270513744933432. Its totient is φ = 252189622140680.

The previous prime is 261196394360813. The next prime is 261196394360851. The reversal of 261196394360831 is 138063493691162.

It is not a de Polignac number, because 261196394360831 - 2⁴⁶ = 190827650183167 is a prime.

It is a super-2 number, since 2×261196394360831² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261196394360851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 155289175355 + ... + 155289177036.

It is an arithmetic number, because the mean of its divisors is an integer number (45085624155572).

Almost surely, 2^{261196394360831} is an apocalyptic number.

261196394360831 is a deficient number, since it is larger than the sum of its proper divisors (9317350572601).

261196394360831 is an equidigital number, since it uses as much as digits as its factorization.

261196394360831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310578352449 (or 310578352420 counting only the distinct ones).

The product of its (nonzero) digits is 30233088, while the sum is 62.

The spelling of 261196394360831 in words is "two hundred sixty-one trillion, one hundred ninety-six billion, three hundred ninety-four million, three hundred sixty thousand, eight hundred thirty-one".