665688046 has 4 divisors (see below), whose sum is σ = 998532072. Its totient is φ = 332844022.

The previous prime is 665688043. The next prime is 665688061. The reversal of 665688046 is 640886566.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665688043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166422010 + ... + 166422013.

It is an arithmetic number, because the mean of its divisors is an integer number (249633018).

Almost surely, 2^665688046 is an apocalyptic number.

665688046 is a deficient number, since it is larger than the sum of its proper divisors (332844026).

665688046 is a wasteful number, since it uses less digits than its factorization.

665688046 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332844025.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The square root of 665688046 is about 25800.9311072294. The cubic root of 665688046 is about 873.1528034605.

The spelling of 665688046 in words is "six hundred sixty-five million, six hundred eighty-eight thousand, forty-six".