669747747966 has 32 divisors (see below), whose sum is σ = 1496908498176. Its totient is φ = 198003768000.

The previous prime is 669747747961. The next prime is 669747747997.

669747747966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 669747747891 and 669747747900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669747747961) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 123749650 + ... + 123755061.

It is an arithmetic number, because the mean of its divisors is an integer number (46778390568).

Almost surely, 2^669747747966 is an apocalyptic number.

669747747966 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

669747747966 is an abundant number, since it is smaller than the sum of its proper divisors (827160750210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669747747966 is a wasteful number, since it uses less digits than its factorization.

669747747966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247504768.

The product of its digits is 4032758016, while the sum is 78.

The spelling of 669747747966 in words is "six hundred sixty-nine billion, seven hundred forty-seven million, seven hundred forty-seven thousand, nine hundred sixty-six".