261080056 has 16 divisors (see below), whose sum is σ = 489839040. Its totient is φ = 130456320.

The previous prime is 261080041. The next prime is 261080063. The reversal of 261080056 is 650080162.

It is a zygodrome in base 2.

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, 3961 + ... + 23191.

It is an arithmetic number, because the mean of its divisors is an integer number (30614940).

Almost surely, 2^261080056 is an apocalyptic number.

It is an amenable number.

261080056 is a deficient number, since it is larger than the sum of its proper divisors (228758984).

261080056 is a wasteful number, since it uses less digits than its factorization.

261080056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20934 (or 20930 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 261080056 is about 16157.9719024387. The cubic root of 261080056 is about 639.1329861350.

The spelling of 261080056 in words is "two hundred sixty-one million, eighty thousand, fifty-six".