665996782 has 8 divisors (see below), whose sum is σ = 1089812952. Its totient is φ = 302725800.

The previous prime is 665996767. The next prime is 665996789. The reversal of 665996782 is 287699566.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665996789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15136269 + ... + 15136312.

It is an arithmetic number, because the mean of its divisors is an integer number (136226619).

Almost surely, 2^665996782 is an apocalyptic number.

665996782 is a deficient number, since it is larger than the sum of its proper divisors (423816170).

665996782 is a wasteful number, since it uses less digits than its factorization.

665996782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30272594.

The product of its digits is 9797760, while the sum is 58.

The square root of 665996782 is about 25806.9134535690. The cubic root of 665996782 is about 873.2877675985.

The spelling of 665996782 in words is "six hundred sixty-five million, nine hundred ninety-six thousand, seven hundred eighty-two".