661150646 has 48 divisors (see below), whose sum is σ = 1100696688. Its totient is φ = 297648000.

The previous prime is 661150627. The next prime is 661150667. The reversal of 661150646 is 646051166.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 3652676 + ... + 3652856.

It is an arithmetic number, because the mean of its divisors is an integer number (22931181).

Almost surely, 2^661150646 is an apocalyptic number.

661150646 is a deficient number, since it is larger than the sum of its proper divisors (439546042).

661150646 is a wasteful number, since it uses less digits than its factorization.

661150646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 661150646 is about 25712.8498226082. The cubic root of 661150646 is about 871.1644450776.

The spelling of 661150646 in words is "six hundred sixty-one million, one hundred fifty thousand, six hundred forty-six".