661285336 has 16 divisors (see below), whose sum is σ = 1240216200. Its totient is φ = 330561024.

The previous prime is 661285333. The next prime is 661285343. The reversal of 661285336 is 633582166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661285333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37131 + ... + 51973.

Almost surely, 2^661285336 is an apocalyptic number.

It is an amenable number.

661285336 is a deficient number, since it is larger than the sum of its proper divisors (578930864).

661285336 is a wasteful number, since it uses less digits than its factorization.

661285336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20418 (or 20414 counting only the distinct ones).

The product of its digits is 155520, while the sum is 40.

The square root of 661285336 is about 25715.4688077041. The cubic root of 661285336 is about 871.2235991059.

The spelling of 661285336 in words is "six hundred sixty-one million, two hundred eighty-five thousand, three hundred thirty-six".