661066982 has 4 divisors (see below), whose sum is σ = 991600476. Its totient is φ = 330533490.

The previous prime is 661066979. The next prime is 661067021. The reversal of 661066982 is 289660166.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165266744 + ... + 165266747.

It is an arithmetic number, because the mean of its divisors is an integer number (247900119).

Almost surely, 2^661066982 is an apocalyptic number.

661066982 is a deficient number, since it is larger than the sum of its proper divisors (330533494).

661066982 is a wasteful number, since it uses less digits than its factorization.

661066982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330533493.

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 661066982 is about 25711.2228802910. Note that the first 3 decimals coincide. The cubic root of 661066982 is about 871.1276969340.

The spelling of 661066982 in words is "six hundred sixty-one million, sixty-six thousand, nine hundred eighty-two".