16391424841 has 27 divisors (see below), whose sum is σ = 18356072007. Its totient is φ = 14626032960.

The previous prime is 16391424839. The next prime is 16391424859. The reversal of 16391424841 is 14842419361.

The square root of 16391424841 is 128029.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 288830025 + 16102594816 = 16995^2 + 126896^2 .

It is not a de Polignac number, because 16391424841 - 2¹ = 16391424839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16391424821) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 145056801 + ... + 145056913.

Almost surely, 2^16391424841 is an apocalyptic number.

16391424841 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16391424841 is the 128029-th square number.

16391424841 is the 64015-th centered octagonal number.

It is an amenable number.

16391424841 is a deficient number, since it is larger than the sum of its proper divisors (1964647166).

16391424841 is an equidigital number, since it uses as much as digits as its factorization.

16391424841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 227 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The spelling of 16391424841 in words is "sixteen billion, three hundred ninety-one million, four hundred twenty-four thousand, eight hundred forty-one".