261552403344563 has 8 divisors (see below), whose sum is σ = 268338303470160. Its totient is φ = 254785863848320.

The previous prime is 261552403344523. The next prime is 261552403344629. The reversal of 261552403344563 is 365443304255162.

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 261552403344563 - 2¹⁸ = 261552403082419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261552403344523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4840129970 + ... + 4840184007.

It is an arithmetic number, because the mean of its divisors is an integer number (33542287933770).

Almost surely, 2^{261552403344563} is an apocalyptic number.

261552403344563 is a deficient number, since it is larger than the sum of its proper divisors (6785900125597).

261552403344563 is an equidigital number, since it uses as much as digits as its factorization.

261552403344563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9680314677.

The product of its (nonzero) digits is 31104000, while the sum is 53.

The spelling of 261552403344563 in words is "two hundred sixty-one trillion, five hundred fifty-two billion, four hundred three million, three hundred forty-four thousand, five hundred sixty-three".