646425599 has 4 divisors (see below), whose sum is σ = 646479264. Its totient is φ = 646371936.

The previous prime is 646425583. The next prime is 646425641. The reversal of 646425599 is 995524646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 646425599 - 2⁴ = 646425583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646425509) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 554 + ... + 35960.

It is an arithmetic number, because the mean of its divisors is an integer number (161619816).

Almost surely, 2^646425599 is an apocalyptic number.

646425599 is a deficient number, since it is larger than the sum of its proper divisors (53665).

646425599 is a wasteful number, since it uses less digits than its factorization.

646425599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53664.

The product of its digits is 2332800, while the sum is 50.

The square root of 646425599 is about 25424.9011600832. The cubic root of 646425599 is about 864.6483469304.

The spelling of 646425599 in words is "six hundred forty-six million, four hundred twenty-five thousand, five hundred ninety-nine".