646295816391 has 8 divisors (see below), whose sum is σ = 861731758464. Its totient is φ = 430861875960.

The previous prime is 646295816359. The next prime is 646295816417. The reversal of 646295816391 is 193618592646.

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

It is not a de Polignac number, because 646295816391 - 2⁵ = 646295816359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646295816321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 596446 + ... + 1283876.

It is an arithmetic number, because the mean of its divisors is an integer number (107716469808).

Almost surely, 2^646295816391 is an apocalyptic number.

646295816391 is a deficient number, since it is larger than the sum of its proper divisors (215435942073).

646295816391 is a wasteful number, since it uses less digits than its factorization.

646295816391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000821.

The product of its digits is 16796160, while the sum is 60.

The spelling of 646295816391 in words is "six hundred forty-six billion, two hundred ninety-five million, eight hundred sixteen thousand, three hundred ninety-one".