661661336 has 64 divisors (see below), whose sum is σ = 1438214400. Its totient is φ = 279531648.

The previous prime is 661661323. The next prime is 661661383. The reversal of 661661336 is 633166166.

It is a self number, because there is not a number n which added to its sum of digits gives 661661336.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 1578935 + ... + 1579353.

It is an arithmetic number, because the mean of its divisors is an integer number (22472100).

Almost surely, 2^661661336 is an apocalyptic number.

It is an amenable number.

661661336 is an abundant number, since it is smaller than the sum of its proper divisors (776553064).

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

661661336 is a wasteful number, since it uses less digits than its factorization.

661661336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 768 (or 764 counting only the distinct ones).

The product of its digits is 69984, while the sum is 38.

The square root of 661661336 is about 25722.7785435400. The cubic root of 661661336 is about 871.3886907281.

The spelling of 661661336 in words is "six hundred sixty-one million, six hundred sixty-one thousand, three hundred thirty-six".