16442140375665 has 24 divisors (see below), whose sum is σ = 28500028950120. Its totient is φ = 8769043390464.

The previous prime is 16442140375663. The next prime is 16442140375699. The reversal of 16442140375665 is 56657304124461.

16442140375665 is a `hidden beast` number, since 1 + 6 + 4 + 4 + 2 + 1 + 40 + 37 + 566 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 89563131441 + 16352577244224 = 299271^2 + 4043832^2 .

It is not a de Polignac number, because 16442140375665 - 2¹ = 16442140375663 is a prime.

It is a super-3 number, since 3×16442140375665³ (a number of 41 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16442140375663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2113731 + ... + 6111639.

It is an arithmetic number, because the mean of its divisors is an integer number (1187501206255).

Almost surely, 2^{16442140375665} is an apocalyptic number.

16442140375665 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16442140375665 is a deficient number, since it is larger than the sum of its proper divisors (12057888574455).

16442140375665 is a wasteful number, since it uses less digits than its factorization.

16442140375665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4089313 (or 4089310 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 54.

The spelling of 16442140375665 in words is "sixteen trillion, four hundred forty-two billion, one hundred forty million, three hundred seventy-five thousand, six hundred sixty-five".