646320522303365 has 128 divisors (see below), whose sum is σ = 1009295078400000. Its totient is φ = 394341732384768.

The previous prime is 646320522303361. The next prime is 646320522303611. The reversal of 646320522303365 is 563303225023646.

It is not a de Polignac number, because 646320522303365 - 2² = 646320522303361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646320522303361) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 391635461 + ... + 393282309.

It is an arithmetic number, because the mean of its divisors is an integer number (7885117800000).

Almost surely, 2^{646320522303365} is an apocalyptic number.

646320522303365 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

646320522303365 is a deficient number, since it is larger than the sum of its proper divisors (362974556096635).

646320522303365 is a wasteful number, since it uses less digits than its factorization.

646320522303365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647524 (or 1647510 counting only the distinct ones).

The product of its (nonzero) digits is 13996800, while the sum is 50.

The spelling of 646320522303365 in words is "six hundred forty-six trillion, three hundred twenty billion, five hundred twenty-two million, three hundred three thousand, three hundred sixty-five".