261665432 has 16 divisors (see below), whose sum is σ = 560711760. Its totient is φ = 112142304.

The previous prime is 261665419. The next prime is 261665471. The reversal of 261665432 is 234566162.

It is a happy number.

261665432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 261665392 and 261665401.

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, 2336243 + ... + 2336354.

It is an arithmetic number, because the mean of its divisors is an integer number (35044485).

Almost surely, 2^261665432 is an apocalyptic number.

It is an amenable number.

261665432 is an abundant number, since it is smaller than the sum of its proper divisors (299046328).

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

261665432 is a wasteful number, since it uses less digits than its factorization.

261665432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4672610 (or 4672606 counting only the distinct ones).

The product of its digits is 51840, while the sum is 35.

The square root of 261665432 is about 16176.0759147576. The cubic root of 261665432 is about 639.6103031258.

The spelling of 261665432 in words is "two hundred sixty-one million, six hundred sixty-five thousand, four hundred thirty-two".