261676125726247 has 4 divisors (see below), whose sum is σ = 268748453448616. Its totient is φ = 254603798003880.

The previous prime is 261676125726241. The next prime is 261676125726283. The reversal of 261676125726247 is 742627521676162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261676125726247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261676125726241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3536163861129 + ... + 3536163861202.

It is an arithmetic number, because the mean of its divisors is an integer number (67187113362154).

Almost surely, 2^{261676125726247} is an apocalyptic number.

261676125726247 is a deficient number, since it is larger than the sum of its proper divisors (7072327722369).

261676125726247 is an equidigital number, since it uses as much as digits as its factorization.

261676125726247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7072327722368.

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

The spelling of 261676125726247 in words is "two hundred sixty-one trillion, six hundred seventy-six billion, one hundred twenty-five million, seven hundred twenty-six thousand, two hundred forty-seven".