1659644242 has 8 divisors (see below), whose sum is σ = 2489739516. Its totient is φ = 829731072.

The previous prime is 1659644201. The next prime is 1659644291. The reversal of 1659644242 is 2424469561.

It can be written as a sum of positive squares in 2 ways, for example, as 1588899321 + 70744921 = 39861^2 + 8411^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19843 + ... + 60934.

Almost surely, 2^1659644242 is an apocalyptic number.

1659644242 is a deficient number, since it is larger than the sum of its proper divisors (830095274).

1659644242 is a wasteful number, since it uses less digits than its factorization.

1659644242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91052.

The product of its digits is 414720, while the sum is 43.

The square root of 1659644242 is about 40738.7314726416. The cubic root of 1659644242 is about 1183.9635562384.

The spelling of 1659644242 in words is "one billion, six hundred fifty-nine million, six hundred forty-four thousand, two hundred forty-two".