661201136 has 20 divisors (see below), whose sum is σ = 1285128312. Its totient is φ = 329555136.

The previous prime is 661201133. The next prime is 661201169. The reversal of 661201136 is 631102166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661201133) by changing a digit.

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, 60110 + ... + 70253.

Almost surely, 2^661201136 is an apocalyptic number.

It is an amenable number.

661201136 is a deficient number, since it is larger than the sum of its proper divisors (623927176).

661201136 is a wasteful number, since it uses less digits than its factorization.

661201136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130688 (or 130682 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 661201136 is about 25713.8316086887. The cubic root of 661201136 is about 871.1866205447.

The spelling of 661201136 in words is "six hundred sixty-one million, two hundred one thousand, one hundred thirty-six".