669192849 has 18 divisors (see below), whose sum is σ = 1046688630. Its totient is φ = 411810048.

The previous prime is 669192833. The next prime is 669192871. The reversal of 669192849 is 948291966.

It can be written as a sum of positive squares in 3 ways, for example, as 85100625 + 584092224 = 9225^2 + 24168^2 .

It is not a de Polignac number, because 669192849 - 2⁴ = 669192833 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 669192795 and 669192804.

It is not an unprimeable number, because it can be changed into a prime (669192899) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 218464 + ... + 221505.

Almost surely, 2^669192849 is an apocalyptic number.

It is an amenable number.

669192849 is a deficient number, since it is larger than the sum of its proper divisors (377495781).

669192849 is a wasteful number, since it uses less digits than its factorization.

669192849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440001 (or 439985 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 669192849 is about 25868.7620306809. The cubic root of 669192849 is about 874.6824857216.

The spelling of 669192849 in words is "six hundred sixty-nine million, one hundred ninety-two thousand, eight hundred forty-nine".