661036650 has 24 divisors (see below), whose sum is σ = 1639371264. Its totient is φ = 176276400.

The previous prime is 661036637. The next prime is 661036679. The reversal of 661036650 is 56630166.

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 11 ways as a sum of consecutive naturals, for example, 2203306 + ... + 2203605.

It is an arithmetic number, because the mean of its divisors is an integer number (68307136).

Almost surely, 2^661036650 is an apocalyptic number.

661036650 is an abundant number, since it is smaller than the sum of its proper divisors (978334614).

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

661036650 is a wasteful number, since it uses less digits than its factorization.

661036650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4406926 (or 4406921 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 661036650 is about 25710.6330143775. The cubic root of 661036650 is about 871.1143732970.

The spelling of 661036650 in words is "six hundred sixty-one million, thirty-six thousand, six hundred fifty".