16683376578881 has 2 divisors, whose sum is σ = 16683376578882. Its totient is φ = 16683376578880.

The previous prime is 16683376578859. The next prime is 16683376578907. The reversal of 16683376578881 is 18887567338661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13157559202225 + 3525817376656 = 3627335^2 + 1877716^2 .

It is a cyclic number.

It is not a de Polignac number, because 16683376578881 - 2²² = 16683372384577 is a prime.

It is a super-2 number, since 2×16683376578881² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (16683376578811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8341688289440 + 8341688289441.

It is an arithmetic number, because the mean of its divisors is an integer number (8341688289441).

Almost surely, 2^{16683376578881} is an apocalyptic number.

It is an amenable number.

16683376578881 is a deficient number, since it is larger than the sum of its proper divisors (1).

16683376578881 is an equidigital number, since it uses as much as digits as its factorization.

16683376578881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1950842880, while the sum is 77.

The spelling of 16683376578881 in words is "sixteen trillion, six hundred eighty-three billion, three hundred seventy-six million, five hundred seventy-eight thousand, eight hundred eighty-one".