261575312663 has 32 divisors (see below), whose sum is σ = 318417792000. Its totient is φ = 214384550688.

The previous prime is 261575312659. The next prime is 261575312723. The reversal of 261575312663 is 366213575162.

It is not a de Polignac number, because 261575312663 - 2² = 261575312659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261575312563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41990033 + ... + 41996261.

It is an arithmetic number, because the mean of its divisors is an integer number (9950556000).

Almost surely, 2^261575312663 is an apocalyptic number.

261575312663 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

261575312663 is a deficient number, since it is larger than the sum of its proper divisors (56842479337).

261575312663 is an equidigital number, since it uses as much as digits as its factorization.

261575312663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11596 (or 11582 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 47.

The spelling of 261575312663 in words is "two hundred sixty-one billion, five hundred seventy-five million, three hundred twelve thousand, six hundred sixty-three".