646670199 has 24 divisors (see below), whose sum is σ = 1035360768. Its totient is φ = 357603120.

The previous prime is 646670197. The next prime is 646670203. The reversal of 646670199 is 991076646.

It is not a de Polignac number, because 646670199 - 2¹ = 646670197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646670197) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 66397 + ... + 75510.

It is an arithmetic number, because the mean of its divisors is an integer number (43140032).

Almost surely, 2^646670199 is an apocalyptic number.

646670199 is a deficient number, since it is larger than the sum of its proper divisors (388690569).

646670199 is a wasteful number, since it uses less digits than its factorization.

646670199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141955 (or 141948 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 646670199 is about 25429.7109499892. The cubic root of 646670199 is about 864.7573908359.

The spelling of 646670199 in words is "six hundred forty-six million, six hundred seventy thousand, one hundred ninety-nine".