261466636 has 6 divisors (see below), whose sum is σ = 457566620. Its totient is φ = 130733316.

The previous prime is 261466631. The next prime is 261466669. The reversal of 261466636 is 636664162.

261466636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (261466631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32683326 + ... + 32683333.

Almost surely, 2^261466636 is an apocalyptic number.

It is an amenable number.

261466636 is a deficient number, since it is larger than the sum of its proper divisors (196099984).

261466636 is a wasteful number, since it uses less digits than its factorization.

261466636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65366663 (or 65366661 counting only the distinct ones).

The product of its digits is 186624, while the sum is 40.

The square root of 261466636 is about 16169.9299936642. The cubic root of 261466636 is about 639.4482842926.

The spelling of 261466636 in words is "two hundred sixty-one million, four hundred sixty-six thousand, six hundred thirty-six".