661153412 has 12 divisors (see below), whose sum is σ = 1217914320. Its totient is φ = 313177896.

The previous prime is 661153403. The next prime is 661153439. The reversal of 661153412 is 214351166.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4349618 + ... + 4349769.

It is an arithmetic number, because the mean of its divisors is an integer number (101492860).

Almost surely, 2^661153412 is an apocalyptic number.

It is an amenable number.

661153412 is a deficient number, since it is larger than the sum of its proper divisors (556760908).

661153412 is a wasteful number, since it uses less digits than its factorization.

661153412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8699410 (or 8699408 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 661153412 is about 25712.9036088887. The cubic root of 661153412 is about 871.1656599482.

The spelling of 661153412 in words is "six hundred sixty-one million, one hundred fifty-three thousand, four hundred twelve".