634666344420 has 48 divisors (see below), whose sum is σ = 1777117063680. Its totient is φ = 169239472896.

The previous prime is 634666344379. The next prime is 634666344451. The reversal of 634666344420 is 24443666436.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 634666344420.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2257584 + ... + 2523096.

It is an arithmetic number, because the mean of its divisors is an integer number (37023272160).

Almost surely, 2^634666344420 is an apocalyptic number.

634666344420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

634666344420 is an abundant number, since it is smaller than the sum of its proper divisors (1142450719260).

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

634666344420 is a wasteful number, since it uses less digits than its factorization.

634666344420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305364 (or 305362 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 48.

The spelling of 634666344420 in words is "six hundred thirty-four billion, six hundred sixty-six million, three hundred forty-four thousand, four hundred twenty".