659991449 has 8 divisors (see below), whose sum is σ = 713049792. Its totient is φ = 607260240.

The previous prime is 659991443. The next prime is 659991461. The reversal of 659991449 is 944199956.

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

It is a cyclic number.

It is not a de Polignac number, because 659991449 - 2⁴ = 659991433 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 659991394 and 659991403.

It is not an unprimeable number, because it can be changed into a prime (659991443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77579 + ... + 85664.

It is an arithmetic number, because the mean of its divisors is an integer number (89131224).

Almost surely, 2^659991449 is an apocalyptic number.

It is an amenable number.

659991449 is a deficient number, since it is larger than the sum of its proper divisors (53058343).

659991449 is a wasteful number, since it uses less digits than its factorization.

659991449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163567.

The product of its digits is 3149280, while the sum is 56.

The square root of 659991449 is about 25690.2987331794. The cubic root of 659991449 is about 870.6550089985.

The spelling of 659991449 in words is "six hundred fifty-nine million, nine hundred ninety-one thousand, four hundred forty-nine".