661212336 has 40 divisors (see below), whose sum is σ = 1709426800. Its totient is φ = 220237056.

The previous prime is 661212301. The next prime is 661212341. The reversal of 661212336 is 633212166.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69906 + ... + 78798.

It is an arithmetic number, because the mean of its divisors is an integer number (42735670).

Almost surely, 2^661212336 is an apocalyptic number.

It is an amenable number.

661212336 is an abundant number, since it is smaller than the sum of its proper divisors (1048214464).

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

661212336 is a wasteful number, since it uses less digits than its factorization.

661212336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10453 (or 10447 counting only the distinct ones).

The product of its digits is 7776, while the sum is 30.

The square root of 661212336 is about 25714.0493893902. The cubic root of 661212336 is about 871.1915394892.

The spelling of 661212336 in words is "six hundred sixty-one million, two hundred twelve thousand, three hundred thirty-six".