661936589434 has 8 divisors (see below), whose sum is σ = 1014030520128. Its totient is φ = 323926416060.

The previous prime is 661936589381. The next prime is 661936589471. The reversal of 661936589434 is 434985639166.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 3520939212 + ... + 3520939399.

It is an arithmetic number, because the mean of its divisors is an integer number (126753815016).

Almost surely, 2^661936589434 is an apocalyptic number.

661936589434 is a deficient number, since it is larger than the sum of its proper divisors (352093930694).

661936589434 is a wasteful number, since it uses less digits than its factorization.

661936589434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041878660.

The product of its digits is 100776960, while the sum is 64.

The spelling of 661936589434 in words is "six hundred sixty-one billion, nine hundred thirty-six million, five hundred eighty-nine thousand, four hundred thirty-four".