261086463 has 32 divisors (see below), whose sum is σ = 422872320. Its totient is φ = 157891680.

The previous prime is 261086453. The next prime is 261086477. The reversal of 261086463 is 364680162.

261086463 is a `hidden beast` number, since 2 + 6 + 1 + 0 + 8 + 646 + 3 = 666.

It is not a de Polignac number, because 261086463 - 2⁵ = 261086431 is a prime.

It is a super-2 number, since 2×261086463² = 136332282323700738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261086453) 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, 233181 + ... + 234297.

It is an arithmetic number, because the mean of its divisors is an integer number (13214760).

Almost surely, 2^261086463 is an apocalyptic number.

261086463 is a deficient number, since it is larger than the sum of its proper divisors (161785857).

261086463 is a wasteful number, since it uses less digits than its factorization.

261086463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 261086463 is about 16158.1701624906. The cubic root of 261086463 is about 639.1382142779.

The spelling of 261086463 in words is "two hundred sixty-one million, eighty-six thousand, four hundred sixty-three".