661896930 has 16 divisors (see below), whose sum is σ = 1588552704. Its totient is φ = 176505840.

The previous prime is 661896923. The next prime is 661896931. The reversal of 661896930 is 39698166.

It is a self number, because there is not a number n which added to its sum of digits gives 661896930.

It is not an unprimeable number, because it can be changed into a prime (661896931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11031586 + ... + 11031645.

It is an arithmetic number, because the mean of its divisors is an integer number (99284544).

Almost surely, 2^661896930 is an apocalyptic number.

661896930 is an abundant number, since it is smaller than the sum of its proper divisors (926655774).

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

661896930 is a wasteful number, since it uses less digits than its factorization.

661896930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22063241.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 661896930 is about 25727.3576179133. The cubic root of 661896930 is about 871.4921019320.

The spelling of 661896930 in words is "six hundred sixty-one million, eight hundred ninety-six thousand, nine hundred thirty".