646201375 has 16 divisors (see below), whose sum is σ = 807300000. Its totient is φ = 516422400.

The previous prime is 646201373. The next prime is 646201379. The reversal of 646201375 is 573102646.

It is a happy number.

It is not a de Polignac number, because 646201375 - 2¹ = 646201373 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 646201375.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646201373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 154056 + ... + 158194.

It is an arithmetic number, because the mean of its divisors is an integer number (50456250).

Almost surely, 2^646201375 is an apocalyptic number.

646201375 is a deficient number, since it is larger than the sum of its proper divisors (161098625).

646201375 is a wasteful number, since it uses less digits than its factorization.

646201375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5403 (or 5393 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 646201375 is about 25420.4912423029. The cubic root of 646201375 is about 864.5483625796.

The spelling of 646201375 in words is "six hundred forty-six million, two hundred one thousand, three hundred seventy-five".