646596695646 has 96 divisors (see below), whose sum is σ = 1611439764480. Its totient is φ = 185316336000.

The previous prime is 646596695629. The next prime is 646596695663.

646596695646 is a `hidden beast` number, since 6 + 4 + 6 + 59 + 6 + 6 + 9 + 564 + 6 = 666.

646596695646 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (646596695629) and next prime (646596695663).

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 2117971 + ... + 2403953.

It is an arithmetic number, because the mean of its divisors is an integer number (16785830880).

Almost surely, 2^646596695646 is an apocalyptic number.

646596695646 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 646596695646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (805719882240).

646596695646 is an abundant number, since it is smaller than the sum of its proper divisors (964843068834).

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

646596695646 is a wasteful number, since it uses less digits than its factorization.

646596695646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286622 (or 286619 counting only the distinct ones).

The product of its digits is 1511654400, while the sum is 72.

The spelling of 646596695646 in words is "six hundred forty-six billion, five hundred ninety-six million, six hundred ninety-five thousand, six hundred forty-six".