646976394159 has 8 divisors (see below), whose sum is σ = 862846690560. Its totient is φ = 431211846936.

The previous prime is 646976394131. The next prime is 646976394193. The reversal of 646976394159 is 951493679646.

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

It is not a de Polignac number, because 646976394159 - 2¹³ = 646976385967 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646976394093 and 646976394102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646976394859) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26423017 + ... + 26447490.

It is an arithmetic number, because the mean of its divisors is an integer number (107855836320).

Almost surely, 2^646976394159 is an apocalyptic number.

646976394159 is a deficient number, since it is larger than the sum of its proper divisors (215870296401).

646976394159 is a wasteful number, since it uses less digits than its factorization.

646976394159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52874589.

The product of its digits is 264539520, while the sum is 69.

The spelling of 646976394159 in words is "six hundred forty-six billion, nine hundred seventy-six million, three hundred ninety-four thousand, one hundred fifty-nine".