659840920437 has 4 divisors (see below), whose sum is σ = 879787893920. Its totient is φ = 439893946956.

The previous prime is 659840920373. The next prime is 659840920471. The reversal of 659840920437 is 734029048956.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 659840920437 - 2⁶ = 659840920373 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 (659840920477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109973486737 + ... + 109973486742.

It is an arithmetic number, because the mean of its divisors is an integer number (219946973480).

Almost surely, 2^659840920437 is an apocalyptic number.

It is an amenable number.

659840920437 is a deficient number, since it is larger than the sum of its proper divisors (219946973483).

659840920437 is a wasteful number, since it uses less digits than its factorization.

659840920437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219946973482.

The product of its (nonzero) digits is 13063680, while the sum is 57.

The spelling of 659840920437 in words is "six hundred fifty-nine billion, eight hundred forty million, nine hundred twenty thousand, four hundred thirty-seven".