261698623678799 has 8 divisors (see below), whose sum is σ = 277705245467520. Its totient is φ = 246077703620056.

The previous prime is 261698623678787. The next prime is 261698623678823. The reversal of 261698623678799 is 997876326896162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261698623678799 - 2⁸ = 261698623678543 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 (261698623678729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 96425431097 + ... + 96425433810.

It is an arithmetic number, because the mean of its divisors is an integer number (34713155683440).

Almost surely, 2^{261698623678799} is an apocalyptic number.

261698623678799 is a deficient number, since it is larger than the sum of its proper divisors (16006621788721).

261698623678799 is a wasteful number, since it uses less digits than its factorization.

261698623678799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192850864989.

The product of its digits is 35554111488, while the sum is 89.

The spelling of 261698623678799 in words is "two hundred sixty-one trillion, six hundred ninety-eight billion, six hundred twenty-three million, six hundred seventy-eight thousand, seven hundred ninety-nine".