1659442197 has 48 divisors (see below), whose sum is σ = 2732449280. Its totient is φ = 874631520.

The previous prime is 1659442181. The next prime is 1659442223. The reversal of 1659442197 is 7912449561.

It is a happy number.

It is not a de Polignac number, because 1659442197 - 2⁴ = 1659442181 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1659442297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5335672 + ... + 5335982.

Almost surely, 2^1659442197 is an apocalyptic number.

It is an amenable number.

1659442197 is a deficient number, since it is larger than the sum of its proper divisors (1073007083).

1659442197 is an equidigital number, since it uses as much as digits as its factorization.

1659442197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694 (or 383 counting only the distinct ones).

The product of its digits is 544320, while the sum is 48.

The square root of 1659442197 is about 40736.2516316855. The cubic root of 1659442197 is about 1183.9155090689.

The spelling of 1659442197 in words is "one billion, six hundred fifty-nine million, four hundred forty-two thousand, one hundred ninety-seven".