261752645 has 48 divisors (see below), whose sum is σ = 415470720. Its totient is φ = 154535040.

The previous prime is 261752629. The next prime is 261752663. The reversal of 261752645 is 546257162.

261752645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 261752645 - 2⁴ = 261752629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 261752599 and 261752608.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 78839 + ... + 82091.

It is an arithmetic number, because the mean of its divisors is an integer number (8655640).

Almost surely, 2^261752645 is an apocalyptic number.

It is an amenable number.

261752645 is a deficient number, since it is larger than the sum of its proper divisors (153718075).

261752645 is a wasteful number, since it uses less digits than its factorization.

261752645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3306 (or 3295 counting only the distinct ones).

The product of its digits is 100800, while the sum is 38.

The square root of 261752645 is about 16178.7714304888. The cubic root of 261752645 is about 639.6813558650.

The spelling of 261752645 in words is "two hundred sixty-one million, seven hundred fifty-two thousand, six hundred forty-five".