261315567 has 6 divisors (see below), whose sum is σ = 377455832. Its totient is φ = 174210372.

The previous prime is 261315559. The next prime is 261315679. The reversal of 261315567 is 765513162.

261315567 is a `hidden beast` number, since 2 + 61 + 31 + 5 + 567 = 666.

It is not a de Polignac number, because 261315567 - 2³ = 261315559 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 (261315367) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14517523 + ... + 14517540.

Almost surely, 2^261315567 is an apocalyptic number.

261315567 is a deficient number, since it is larger than the sum of its proper divisors (116140265).

261315567 is a wasteful number, since it uses less digits than its factorization.

261315567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29035069 (or 29035066 counting only the distinct ones).

The product of its digits is 37800, while the sum is 36.

The square root of 261315567 is about 16165.2580245414. The cubic root of 261315567 is about 639.3251080627.

The spelling of 261315567 in words is "two hundred sixty-one million, three hundred fifteen thousand, five hundred sixty-seven".