1659041999 has 4 divisors (see below), whose sum is σ = 1699506480. Its totient is φ = 1618577520.

The previous prime is 1659041971. The next prime is 1659042013. The reversal of 1659041999 is 9991409561.

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 1659041999 - 2⁸ = 1659041743 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1659041999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659041299) 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, 20232179 + ... + 20232260.

It is an arithmetic number, because the mean of its divisors is an integer number (424876620).

Almost surely, 2^1659041999 is an apocalyptic number.

1659041999 is a deficient number, since it is larger than the sum of its proper divisors (40464481).

1659041999 is an equidigital number, since it uses as much as digits as its factorization.

1659041999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40464480.

The product of its (nonzero) digits is 787320, while the sum is 53.

The square root of 1659041999 is about 40731.3392733409. The cubic root of 1659041999 is about 1183.8203287501.

The spelling of 1659041999 in words is "one billion, six hundred fifty-nine million, forty-one thousand, nine hundred ninety-nine".