669534435966 has 48 divisors (see below), whose sum is σ = 1472468214672. Its totient is φ = 202806637440.

The previous prime is 669534435943. The next prime is 669534435967.

669534435966 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a junction number, because it is equal to n+sod(n) for n = 669534435897 and 669534435906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669534435967) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1608940 + ... + 1981856.

It is an arithmetic number, because the mean of its divisors is an integer number (30676421139).

Almost surely, 2^669534435966 is an apocalyptic number.

669534435966 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

669534435966 is an abundant number, since it is smaller than the sum of its proper divisors (802933778706).

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

669534435966 is a wasteful number, since it uses less digits than its factorization.

669534435966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375417 (or 375406 counting only the distinct ones).

The product of its digits is 377913600, while the sum is 66.

The spelling of 669534435966 in words is "six hundred sixty-nine billion, five hundred thirty-four million, four hundred thirty-five thousand, nine hundred sixty-six".