661282739884 has 48 divisors (see below), whose sum is σ = 1270718215200. Its totient is φ = 299227069440.

The previous prime is 661282739731. The next prime is 661282739903. The reversal of 661282739884 is 488937282166.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3662767 + ... + 3839065.

It is an arithmetic number, because the mean of its divisors is an integer number (26473296150).

Almost surely, 2^661282739884 is an apocalyptic number.

It is an amenable number.

661282739884 is a deficient number, since it is larger than the sum of its proper divisors (609435475316).

661282739884 is a wasteful number, since it uses less digits than its factorization.

661282739884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177730 (or 177728 counting only the distinct ones).

The product of its digits is 55738368, while the sum is 64.

The spelling of 661282739884 in words is "six hundred sixty-one billion, two hundred eighty-two million, seven hundred thirty-nine thousand, eight hundred eighty-four".