261553896 has 48 divisors (see below), whose sum is σ = 710014500. Its totient is φ = 86982912.

The previous prime is 261553889. The next prime is 261553921. The reversal of 261553896 is 698355162.

261553896 is a `hidden beast` number, since 2 + 6 + 1 + 553 + 8 + 96 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 251856900 + 9696996 = 15870^2 + 3114^2 .

It is a super-3 number, since 3×261553896³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28930 + ... + 36878.

Almost surely, 2^261553896 is an apocalyptic number.

It is an amenable number.

261553896 is an abundant number, since it is smaller than the sum of its proper divisors (448460604).

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

261553896 is a wasteful number, since it uses less digits than its factorization.

261553896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8418 (or 8411 counting only the distinct ones).

The product of its digits is 388800, while the sum is 45.

The square root of 261553896 is about 16172.6279868177. The cubic root of 261553896 is about 639.5194113422.

The spelling of 261553896 in words is "two hundred sixty-one million, five hundred fifty-three thousand, eight hundred ninety-six".