660841982 has 4 divisors (see below), whose sum is σ = 991262976. Its totient is φ = 330420990.

The previous prime is 660841963. The next prime is 660841997. The reversal of 660841982 is 289148066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 289148066 = 2 ⋅144574033.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 165210494 + ... + 165210497.

It is an arithmetic number, because the mean of its divisors is an integer number (247815744).

Almost surely, 2^660841982 is an apocalyptic number.

660841982 is a deficient number, since it is larger than the sum of its proper divisors (330420994).

660841982 is a wasteful number, since it uses less digits than its factorization.

660841982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330420993.

The product of its (nonzero) digits is 165888, while the sum is 44.

The square root of 660841982 is about 25706.8469867465. The cubic root of 660841982 is about 871.0288537110.

The spelling of 660841982 in words is "six hundred sixty million, eight hundred forty-one thousand, nine hundred eighty-two".