1659641366 has 4 divisors (see below), whose sum is σ = 2489462052. Its totient is φ = 829820682.

The previous prime is 1659641363. The next prime is 1659641381. The reversal of 1659641366 is 6631469561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6631469561 = 49681 ⋅133481.

It is a self number, because there is not a number n which added to its sum of digits gives 1659641366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659641363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 414910340 + ... + 414910343.

It is an arithmetic number, because the mean of its divisors is an integer number (622365513).

Almost surely, 2^1659641366 is an apocalyptic number.

1659641366 is a deficient number, since it is larger than the sum of its proper divisors (829820686).

1659641366 is an equidigital number, since it uses as much as digits as its factorization.

1659641366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 829820685.

The product of its digits is 699840, while the sum is 47.

The square root of 1659641366 is about 40738.6961745218. The cubic root of 1659641366 is about 1183.9628723406.

The spelling of 1659641366 in words is "one billion, six hundred fifty-nine million, six hundred forty-one thousand, three hundred sixty-six".