646115511646 has 16 divisors (see below), whose sum is σ = 1059573393648. Its totient is φ = 293051795200.

The previous prime is 646115511637. The next prime is 646115511721.

It is a happy number.

646115511646 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 646115511596 and 646115511605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31843315 + ... + 31863598.

It is an arithmetic number, because the mean of its divisors is an integer number (66223337103).

Almost surely, 2^646115511646 is an apocalyptic number.

646115511646 is a deficient number, since it is larger than the sum of its proper divisors (413457882002).

646115511646 is a wasteful number, since it uses less digits than its factorization.

646115511646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63707387.

The product of its digits is 518400, while the sum is 46.

The spelling of 646115511646 in words is "six hundred forty-six billion, one hundred fifteen million, five hundred eleven thousand, six hundred forty-six".