1659143899 has 12 divisors (see below), whose sum is σ = 1948181872. Its totient is φ = 1383140880.

The previous prime is 1659143887. The next prime is 1659143923. The reversal of 1659143899 is 9983419561.

It is not a de Polignac number, because 1659143899 - 2¹¹ = 1659141851 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1659143809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 654264 + ... + 656794.

Almost surely, 2^1659143899 is an apocalyptic number.

1659143899 is a deficient number, since it is larger than the sum of its proper divisors (289037973).

1659143899 is an frugal number, since it uses more digits than its factorization.

1659143899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5106 (or 2575 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 55.

The square root of 1659143899 is about 40732.5901337001. The cubic root of 1659143899 is about 1183.8445653923.

The spelling of 1659143899 in words is "one billion, six hundred fifty-nine million, one hundred forty-three thousand, eight hundred ninety-nine".