669799997966 has 64 divisors (see below), whose sum is σ = 1187345433600. Its totient is φ = 280173062400.

The previous prime is 669799997963. The next prime is 669799997969.

669799997966 is nontrivially palindromic in base 10.

669799997966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (669799997963) and next prime (669799997969).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669799997963) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4042175 + ... + 4204613.

It is an arithmetic number, because the mean of its divisors is an integer number (18552272400).

Almost surely, 2^669799997966 is an apocalyptic number.

669799997966 is a deficient number, since it is larger than the sum of its proper divisors (517545435634).

669799997966 is a wasteful number, since it uses less digits than its factorization.

669799997966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162785.

The product of its digits is 33748629264, while the sum is 92.

The spelling of 669799997966 in words is "six hundred sixty-nine billion, seven hundred ninety-nine million, nine hundred ninety-seven thousand, nine hundred sixty-six".