1659475943 has 4 divisors (see below), whose sum is σ = 1699951008. Its totient is φ = 1619000880.

The previous prime is 1659475901. The next prime is 1659475969. The reversal of 1659475943 is 3495749561.

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 1659475943 - 2⁶ = 1659475879 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659477943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20237471 + ... + 20237552.

It is an arithmetic number, because the mean of its divisors is an integer number (424987752).

Almost surely, 2^1659475943 is an apocalyptic number.

1659475943 is a deficient number, since it is larger than the sum of its proper divisors (40475065).

1659475943 is an equidigital number, since it uses as much as digits as its factorization.

1659475943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40475064.

The product of its digits is 4082400, while the sum is 53.

The square root of 1659475943 is about 40736.6658306740. The cubic root of 1659475943 is about 1183.9235342840.

The spelling of 1659475943 in words is "one billion, six hundred fifty-nine million, four hundred seventy-five thousand, nine hundred forty-three".