669705485409 has 16 divisors (see below), whose sum is σ = 992208667200. Its totient is φ = 446446747008.

The previous prime is 669705485399. The next prime is 669705485411. The reversal of 669705485409 is 904584507966.

669705485409 is a `hidden beast` number, since 66 + 97 + 0 + 5 + 4 + 85 + 409 = 666.

It is not a de Polignac number, because 669705485409 - 2²⁰ = 669704436833 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (669705485479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126384 + ... + 1164209.

It is an arithmetic number, because the mean of its divisors is an integer number (62013041700).

Almost surely, 2^669705485409 is an apocalyptic number.

It is an amenable number.

669705485409 is a deficient number, since it is larger than the sum of its proper divisors (322503181791).

669705485409 is a wasteful number, since it uses less digits than its factorization.

669705485409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309821 (or 1309815 counting only the distinct ones).

The product of its (nonzero) digits is 65318400, while the sum is 63.

The spelling of 669705485409 in words is "six hundred sixty-nine billion, seven hundred five million, four hundred eighty-five thousand, four hundred nine".