646586871558 has 32 divisors (see below), whose sum is σ = 1342882437120. Its totient is φ = 207327439680.

The previous prime is 646586871547. The next prime is 646586871559. The reversal of 646586871558 is 855178685646.

It is a junction number, because it is equal to n+sod(n) for n = 646586871492 and 646586871501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646586871559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10376943 + ... + 10439066.

It is an arithmetic number, because the mean of its divisors is an integer number (41965076160).

Almost surely, 2^646586871558 is an apocalyptic number.

646586871558 is an abundant number, since it is smaller than the sum of its proper divisors (696295565562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646586871558 is a wasteful number, since it uses less digits than its factorization.

646586871558 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20816212.

The product of its digits is 387072000, while the sum is 69.

The spelling of 646586871558 in words is "six hundred forty-six billion, five hundred eighty-six million, eight hundred seventy-one thousand, five hundred fifty-eight".