16278958081 has 4 divisors (see below), whose sum is σ = 16321462272. Its totient is φ = 16236453892.

The previous prime is 16278958063. The next prime is 16278958093. The reversal of 16278958081 is 18085987261.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16278958081 - 2¹³ = 16278949889 is a prime.

It is a super-2 number, since 2×16278958081² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16278958021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21251521 + ... + 21252286.

It is an arithmetic number, because the mean of its divisors is an integer number (4080365568).

Almost surely, 2^16278958081 is an apocalyptic number.

It is an amenable number.

16278958081 is a deficient number, since it is larger than the sum of its proper divisors (42504191).

16278958081 is an equidigital number, since it uses as much as digits as its factorization.

16278958081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42504190.

The product of its (nonzero) digits is 1935360, while the sum is 55.

The spelling of 16278958081 in words is "sixteen billion, two hundred seventy-eight million, nine hundred fifty-eight thousand, eighty-one".