646118159 has 4 divisors (see below), whose sum is σ = 647698320. Its totient is φ = 644538000.

The previous prime is 646118147. The next prime is 646118183. The reversal of 646118159 is 951811646.

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 646118159 - 2¹⁶ = 646052623 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 (646118119) 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, 789467 + ... + 790284.

It is an arithmetic number, because the mean of its divisors is an integer number (161924580).

Almost surely, 2^646118159 is an apocalyptic number.

646118159 is a deficient number, since it is larger than the sum of its proper divisors (1580161).

646118159 is a wasteful number, since it uses less digits than its factorization.

646118159 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1580160.

The product of its digits is 51840, while the sum is 41.

The square root of 646118159 is about 25418.8543998348. The cubic root of 646118159 is about 864.5112496157.

The spelling of 646118159 in words is "six hundred forty-six million, one hundred eighteen thousand, one hundred fifty-nine".