261663432 has 16 divisors (see below), whose sum is σ = 654158640. Its totient is φ = 87221136.

The previous prime is 261663397. The next prime is 261663481. The reversal of 261663432 is 234366162.

261663432 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 261663393 and 261663402.

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, 5451298 + ... + 5451345.

It is an arithmetic number, because the mean of its divisors is an integer number (40884915).

Almost surely, 2^261663432 is an apocalyptic number.

It is an amenable number.

261663432 is an abundant number, since it is smaller than the sum of its proper divisors (392495208).

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

261663432 is a wasteful number, since it uses less digits than its factorization.

261663432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10902652 (or 10902648 counting only the distinct ones).

The product of its digits is 31104, while the sum is 33.

The square root of 261663432 is about 16176.0140949493. The cubic root of 261663432 is about 639.6086735336.

The spelling of 261663432 in words is "two hundred sixty-one million, six hundred sixty-three thousand, four hundred thirty-two".