261667361256674 has 16 divisors (see below), whose sum is σ = 394853685747576. Its totient is φ = 130051709827200.

The previous prime is 261667361256671. The next prime is 261667361256703. The reversal of 261667361256674 is 476652163766162.

It can be written as a sum of positive squares in 4 ways, for example, as 110504393579449 + 151162967677225 = 10512107^2 + 12294835^2 .

It is not an unprimeable number, because it can be changed into a prime (261667361256671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 560721347 + ... + 561187814.

Almost surely, 2^{261667361256674} is an apocalyptic number.

261667361256674 is a deficient number, since it is larger than the sum of its proper divisors (133186324490902).

261667361256674 is a wasteful number, since it uses less digits than its factorization.

261667361256674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121909861.

The product of its digits is 548674560, while the sum is 68.

The spelling of 261667361256674 in words is "two hundred sixty-one trillion, six hundred sixty-seven billion, three hundred sixty-one million, two hundred fifty-six thousand, six hundred seventy-four".