1669856249 has 8 divisors (see below), whose sum is σ = 1760844000. Its totient is φ = 1579178592.

The previous prime is 1669856219. The next prime is 1669856267. The reversal of 1669856249 is 9426589661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1669856249 - 2²⁸ = 1401420793 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1669856194 and 1669856203.

It is not an unprimeable number, because it can be changed into a prime (1669856219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66419 + ... + 88040.

It is an arithmetic number, because the mean of its divisors is an integer number (220105500).

Almost surely, 2^1669856249 is an apocalyptic number.

1669856249 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1669856249 is a deficient number, since it is larger than the sum of its proper divisors (90987751).

1669856249 is a wasteful number, since it uses less digits than its factorization.

1669856249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155047.

The product of its digits is 5598720, while the sum is 56.

The square root of 1669856249 is about 40863.8746205007. The cubic root of 1669856249 is about 1186.3869531344.

The spelling of 1669856249 in words is "one billion, six hundred sixty-nine million, eight hundred fifty-six thousand, two hundred forty-nine".