261645112 has 16 divisors (see below), whose sum is σ = 490860000. Its totient is φ = 130749120.

The previous prime is 261645101. The next prime is 261645127. The reversal of 261645112 is 211546162.

261645112 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 7812 + ... + 24172.

It is an arithmetic number, because the mean of its divisors is an integer number (30678750).

Almost surely, 2^261645112 is an apocalyptic number.

It is an amenable number.

261645112 is a deficient number, since it is larger than the sum of its proper divisors (229214888).

261645112 is a wasteful number, since it uses less digits than its factorization.

261645112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18366 (or 18362 counting only the distinct ones).

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

The square root of 261645112 is about 16175.4478145120. The cubic root of 261645112 is about 639.5937460823.

The spelling of 261645112 in words is "two hundred sixty-one million, six hundred forty-five thousand, one hundred twelve".