261481864415 has 8 divisors (see below), whose sum is σ = 313811396640. Its totient is φ = 209163385312.

The previous prime is 261481864379. The next prime is 261481864433. The reversal of 261481864415 is 514468184162.

It is a happy number.

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 261481864415 - 2¹⁴ = 261481848031 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2711144 + ... + 2805933.

It is an arithmetic number, because the mean of its divisors is an integer number (39226424580).

Almost surely, 2^261481864415 is an apocalyptic number.

261481864415 is a deficient number, since it is larger than the sum of its proper divisors (52329532225).

261481864415 is an equidigital number, since it uses as much as digits as its factorization.

261481864415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5526561.

The product of its digits is 1474560, while the sum is 50.

The spelling of 261481864415 in words is "two hundred sixty-one billion, four hundred eighty-one million, eight hundred sixty-four thousand, four hundred fifteen".