16394338280565 has 32 divisors (see below), whose sum is σ = 33309131746560. Its totient is φ = 7494554642112.

The previous prime is 16394338280531. The next prime is 16394338280569. The reversal of 16394338280565 is 56508283349361.

It is a happy number.

16394338280565 is a `hidden beast` number, since 1 + 6 + 3 + 9 + 43 + 3 + 8 + 28 + 0 + 565 = 666.

It is not a de Polignac number, because 16394338280565 - 2¹¹ = 16394338278517 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16394338280569) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8674252114 + ... + 8674254003.

It is an arithmetic number, because the mean of its divisors is an integer number (1040910367080).

Almost surely, 2^{16394338280565} is an apocalyptic number.

16394338280565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16394338280565 is an abundant number, since it is smaller than the sum of its proper divisors (16914793465995).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16394338280565 is a wasteful number, since it uses less digits than its factorization.

16394338280565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17348506138 (or 17348506132 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 63.

The spelling of 16394338280565 in words is "sixteen trillion, three hundred ninety-four billion, three hundred thirty-eight million, two hundred eighty thousand, five hundred sixty-five".