1669917539 has 4 divisors (see below), whose sum is σ = 1683066624. Its totient is φ = 1656768456.

The previous prime is 1669917499. The next prime is 1669917551. The reversal of 1669917539 is 9357199661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1669917539 - 2²⁸ = 1401482083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1669917589) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6574352 + ... + 6574605.

It is an arithmetic number, because the mean of its divisors is an integer number (420766656).

Almost surely, 2^1669917539 is an apocalyptic number.

1669917539 is a deficient number, since it is larger than the sum of its proper divisors (13149085).

1669917539 is a wasteful number, since it uses less digits than its factorization.

1669917539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13149084.

The product of its digits is 2755620, while the sum is 56.

The square root of 1669917539 is about 40864.6245425062. The cubic root of 1669917539 is about 1186.4014679101.

The spelling of 1669917539 in words is "one billion, six hundred sixty-nine million, nine hundred seventeen thousand, five hundred thirty-nine".