16661535341331 has 8 divisors (see below), whose sum is σ = 22375203336640. Its totient is φ = 11027778786792.

The previous prime is 16661535341329. The next prime is 16661535341377. The reversal of 16661535341331 is 13314353516661.

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

It is not a de Polignac number, because 16661535341331 - 2¹ = 16661535341329 is a prime.

It is a super-2 number, since 2×16661535341331² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16661535341431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19977859705 + ... + 19977860538.

It is an arithmetic number, because the mean of its divisors is an integer number (2796900417080).

Almost surely, 2^{16661535341331} is an apocalyptic number.

16661535341331 is a deficient number, since it is larger than the sum of its proper divisors (5713667995309).

16661535341331 is a wasteful number, since it uses less digits than its factorization.

16661535341331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39955720385.

The product of its digits is 1749600, while the sum is 48.

Adding to 16661535341331 its reverse (13314353516661), we get a palindrome (29975888857992).

The spelling of 16661535341331 in words is "sixteen trillion, six hundred sixty-one billion, five hundred thirty-five million, three hundred forty-one thousand, three hundred thirty-one".