261010664 has 32 divisors (see below), whose sum is σ = 499024800. Its totient is φ = 127963200.

The previous prime is 261010663. The next prime is 261010679. The reversal of 261010664 is 466010162.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (261010663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84947 + ... + 87965.

It is an arithmetic number, because the mean of its divisors is an integer number (15594525).

Almost surely, 2^261010664 is an apocalyptic number.

It is an amenable number.

261010664 is a deficient number, since it is larger than the sum of its proper divisors (238014136).

261010664 is a wasteful number, since it uses less digits than its factorization.

261010664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233 (or 3229 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 261010664 is about 16155.8244605467. The cubic root of 261010664 is about 639.0763564474.

The spelling of 261010664 in words is "two hundred sixty-one million, ten thousand, six hundred sixty-four".