646161646 has 16 divisors (see below), whose sum is σ = 1044376704. Its totient is φ = 298063584.

The previous prime is 646161643. The next prime is 646161661.

646161646 is nontrivially palindromic in base 10.

646161646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×646161646² = 835049745522858632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 646161599 and 646161608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646161641) 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, 49920 + ... + 61516.

It is an arithmetic number, because the mean of its divisors is an integer number (65273544).

Almost surely, 2^646161646 is an apocalyptic number.

646161646 is a deficient number, since it is larger than the sum of its proper divisors (398215058).

646161646 is a wasteful number, since it uses less digits than its factorization.

646161646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13755.

The product of its digits is 124416, while the sum is 40.

The square root of 646161646 is about 25419.7097937801. The cubic root of 646161646 is about 864.5306444982.

The spelling of 646161646 in words is "six hundred forty-six million, one hundred sixty-one thousand, six hundred forty-six".