661153256 has 16 divisors (see below), whose sum is σ = 1312583940. Its totient is φ = 311130880.

The previous prime is 661153153. The next prime is 661153267. The reversal of 661153256 is 652351166.

661153256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 640596100 + 20557156 = 25310^2 + 4534^2 .

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, 2430575 + ... + 2430846.

Almost surely, 2^661153256 is an apocalyptic number.

It is an amenable number.

661153256 is a deficient number, since it is larger than the sum of its proper divisors (651430684).

661153256 is a wasteful number, since it uses less digits than its factorization.

661153256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4861444 (or 4861440 counting only the distinct ones).

The product of its digits is 32400, while the sum is 35.

The square root of 661153256 is about 25712.9005753921. The cubic root of 661153256 is about 871.1655914307.

The spelling of 661153256 in words is "six hundred sixty-one million, one hundred fifty-three thousand, two hundred fifty-six".