646166430 has 432 divisors, whose sum is σ = 2305668240. Its totient is φ = 128314368.

The previous prime is 646166401. The next prime is 646166441. The reversal of 646166430 is 34661646.

646166430 is a `hidden beast` number, since 6 + 4 + 6 + 1 + 6 + 643 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 38009782 + ... + 38009798.

It is an arithmetic number, because the mean of its divisors is an integer number (5337195).

Almost surely, 2^646166430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 646166430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1152834120).

646166430 is an abundant number, since it is smaller than the sum of its proper divisors (1659501810).

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

646166430 is a wasteful number, since it uses less digits than its factorization.

646166430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 646166430 is about 25419.8038938148. The cubic root of 646166430 is about 864.5327780739.

The spelling of 646166430 in words is "six hundred forty-six million, one hundred sixty-six thousand, four hundred thirty".