261116644 has 12 divisors (see below), whose sum is σ = 457187500. Its totient is φ = 130491648.

The previous prime is 261116633. The next prime is 261116707. The reversal of 261116644 is 446611162.

It can be written as a sum of positive squares in 2 ways, for example, as 202777600 + 58339044 = 14240^2 + 7638^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7269 + ... + 23980.

Almost surely, 2^261116644 is an apocalyptic number.

It is an amenable number.

261116644 is a deficient number, since it is larger than the sum of its proper divisors (196070856).

261116644 is a wasteful number, since it uses less digits than its factorization.

261116644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33342 (or 33340 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 261116644 is about 16159.1040593221. The cubic root of 261116644 is about 639.1628409693.

The spelling of 261116644 in words is "two hundred sixty-one million, one hundred sixteen thousand, six hundred forty-four".