646525646 has 16 divisors (see below), whose sum is σ = 1078078848. Its totient is φ = 288770400.

The previous prime is 646525619. The next prime is 646525687.

It is a happy number.

646525646 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 646525597 and 646525606.

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, 400265 + ... + 401876.

It is an arithmetic number, because the mean of its divisors is an integer number (67379928).

Almost surely, 2^646525646 is an apocalyptic number.

646525646 is a deficient number, since it is larger than the sum of its proper divisors (431553202).

646525646 is a wasteful number, since it uses less digits than its factorization.

646525646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802187.

The product of its digits is 1036800, while the sum is 44.

The square root of 646525646 is about 25426.8685842358. The cubic root of 646525646 is about 864.6929517083.

The spelling of 646525646 in words is "six hundred forty-six million, five hundred twenty-five thousand, six hundred forty-six".