16335643365 has 24 divisors (see below), whose sum is σ = 28319480280. Its totient is φ = 8711000064.

The previous prime is 16335643361. The next prime is 16335643367. The reversal of 16335643365 is 56334653361.

16335643365 is a `hidden beast` number, since 1 + 633 + 5 + 6 + 4 + 3 + 3 + 6 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 7403841 + 16328239524 = 2721^2 + 127782^2 .

It is not a de Polignac number, because 16335643365 - 2² = 16335643361 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16335643365.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16335643361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 312769 + ... + 361241.

It is an arithmetic number, because the mean of its divisors is an integer number (1179978345).

Almost surely, 2^16335643365 is an apocalyptic number.

16335643365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16335643365 is a deficient number, since it is larger than the sum of its proper divisors (11983836915).

16335643365 is a wasteful number, since it uses less digits than its factorization.

16335643365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55973 (or 55970 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 45.

The spelling of 16335643365 in words is "sixteen billion, three hundred thirty-five million, six hundred forty-three thousand, three hundred sixty-five".