646404194795 has 8 divisors (see below), whose sum is σ = 775734911280. Its totient is φ = 517090104160.

The previous prime is 646404194783. The next prime is 646404194797. The reversal of 646404194795 is 597491404646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 646404194795 - 2²⁶ = 646337085931 is a prime.

It is not an unprimeable number, because it can be changed into a prime (646404194797) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 4070765 + ... + 4226574.

It is an arithmetic number, because the mean of its divisors is an integer number (96966863910).

Almost surely, 2^646404194795 is an apocalyptic number.

646404194795 is a deficient number, since it is larger than the sum of its proper divisors (129330716485).

646404194795 is a wasteful number, since it uses less digits than its factorization.

646404194795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8312925.

The product of its (nonzero) digits is 26127360, while the sum is 59.

The spelling of 646404194795 in words is "six hundred forty-six billion, four hundred four million, one hundred ninety-four thousand, seven hundred ninety-five".