661333158 has 24 divisors (see below), whose sum is σ = 1433874000. Its totient is φ = 220292784.

The previous prime is 661333151. The next prime is 661333159. The reversal of 661333158 is 851333166.

It is a happy number.

661333158 is a `hidden beast` number, since 6 + 613 + 3 + 31 + 5 + 8 = 666.

661333158 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661333151) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16023 + ... + 39741.

It is an arithmetic number, because the mean of its divisors is an integer number (59744750).

Almost surely, 2^661333158 is an apocalyptic number.

661333158 is an abundant number, since it is smaller than the sum of its proper divisors (772540842).

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

661333158 is a wasteful number, since it uses less digits than its factorization.

661333158 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25276 (or 25273 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 661333158 is about 25716.3986203356. The cubic root of 661333158 is about 871.2445999499.

The spelling of 661333158 in words is "six hundred sixty-one million, three hundred thirty-three thousand, one hundred fifty-eight".