661435244 has 12 divisors (see below), whose sum is σ = 1166348568. Its totient is φ = 328192800.

The previous prime is 661435237. The next prime is 661435259. The reversal of 661435244 is 442534166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 630617 + ... + 631664.

It is an arithmetic number, because the mean of its divisors is an integer number (97195714).

Almost surely, 2^661435244 is an apocalyptic number.

It is an amenable number.

661435244 is a deficient number, since it is larger than the sum of its proper divisors (504913324).

661435244 is a wasteful number, since it uses less digits than its factorization.

661435244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1262416 (or 1262414 counting only the distinct ones).

The product of its digits is 69120, while the sum is 35.

The square root of 661435244 is about 25718.3833862084. The cubic root of 661435244 is about 871.2894272300.

The spelling of 661435244 in words is "six hundred sixty-one million, four hundred thirty-five thousand, two hundred forty-four".