261646776732772 has 12 divisors (see below), whose sum is σ = 459109424591356. Its totient is φ = 130472655420960.

The previous prime is 261646776732661. The next prime is 261646776732791. The reversal of 261646776732772 is 277237677646162.

It can be written as a sum of positive squares in 2 ways, for example, as 130771483607296 + 130875293125476 = 11435536^2 + 11440074^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261646776732695 and 261646776732704.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 87683234679 + ... + 87683237662.

Almost surely, 2^{261646776732772} is an apocalyptic number.

It is an amenable number.

261646776732772 is a deficient number, since it is larger than the sum of its proper divisors (197462647858584).

261646776732772 is a wasteful number, since it uses less digits than its factorization.

261646776732772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175366472718 (or 175366472716 counting only the distinct ones).

The product of its digits is 2091059712, while the sum is 73.

The spelling of 261646776732772 in words is "two hundred sixty-one trillion, six hundred forty-six billion, seven hundred seventy-six million, seven hundred thirty-two thousand, seven hundred seventy-two".