661106579 has 6 divisors (see below), whose sum is σ = 769042404. Its totient is φ = 566662740.

The previous prime is 661106569. The next prime is 661106599. The reversal of 661106579 is 975601166.

It is a de Polignac number, because none of the positive numbers 2^k-661106579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661106569) 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 5 ways as a sum of consecutive naturals, for example, 6745937 + ... + 6746034.

It is an arithmetic number, because the mean of its divisors is an integer number (128173734).

Almost surely, 2^661106579 is an apocalyptic number.

661106579 is a deficient number, since it is larger than the sum of its proper divisors (107935825).

661106579 is a wasteful number, since it uses less digits than its factorization.

661106579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13491985 (or 13491978 counting only the distinct ones).

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 661106579 is about 25711.9929021459. The cubic root of 661106579 is about 871.1450897023.

The spelling of 661106579 in words is "six hundred sixty-one million, one hundred six thousand, five hundred seventy-nine".