261516256 has 24 divisors (see below), whose sum is σ = 537246864. Its totient is φ = 125072640.

The previous prime is 261516223. The next prime is 261516289. The reversal of 261516256 is 652615162.

It is an interprime number because it is at equal distance from previous prime (261516223) and next prime (261516289).

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 176925 + ... + 178396.

It is an arithmetic number, because the mean of its divisors is an integer number (22385286).

Almost surely, 2^261516256 is an apocalyptic number.

It is an amenable number.

261516256 is an abundant number, since it is smaller than the sum of its proper divisors (275730608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261516256 is a wasteful number, since it uses less digits than its factorization.

261516256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355354 (or 355346 counting only the distinct ones).

The product of its digits is 21600, while the sum is 34.

The square root of 261516256 is about 16171.4642503392. The cubic root of 261516256 is about 639.4887323046.

The spelling of 261516256 in words is "two hundred sixty-one million, five hundred sixteen thousand, two hundred fifty-six".