261676740416725 has 6 divisors (see below), whose sum is σ = 324479158116770. Its totient is φ = 209341392333360.

The previous prime is 261676740416713. The next prime is 261676740416747. The reversal of 261676740416725 is 527614047676162.

It can be written as a sum of positive squares in 3 ways, for example, as 17768029065796 + 243908711350929 = 4215214^2 + 15617577^2 .

It is a de Polignac number, because none of the positive numbers 2^k-261676740416725 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5233534808310 + ... + 5233534808359.

Almost surely, 2^{261676740416725} is an apocalyptic number.

261676740416725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261676740416725 is a deficient number, since it is larger than the sum of its proper divisors (62802417700045).

261676740416725 is a wasteful number, since it uses less digits than its factorization.

261676740416725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10467069616679 (or 10467069616674 counting only the distinct ones).

The product of its (nonzero) digits is 142248960, while the sum is 64.

The spelling of 261676740416725 in words is "two hundred sixty-one trillion, six hundred seventy-six billion, seven hundred forty million, four hundred sixteen thousand, seven hundred twenty-five".