660959799 has 4 divisors (see below), whose sum is σ = 881279736. Its totient is φ = 440639864.

The previous prime is 660959797. The next prime is 660959807. The reversal of 660959799 is 997959066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660959799 - 2¹ = 660959797 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660959791) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 110159964 + ... + 110159969.

It is an arithmetic number, because the mean of its divisors is an integer number (220319934).

Almost surely, 2^660959799 is an apocalyptic number.

660959799 is a deficient number, since it is larger than the sum of its proper divisors (220319937).

660959799 is a wasteful number, since it uses less digits than its factorization.

660959799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220319936.

The product of its (nonzero) digits is 8266860, while the sum is 60.

The square root of 660959799 is about 25709.1384336387. The cubic root of 660959799 is about 871.0806138954.

The spelling of 660959799 in words is "six hundred sixty million, nine hundred fifty-nine thousand, seven hundred ninety-nine".