16422881378 has 6 divisors (see below), whose sum is σ = 24634593921. Its totient is φ = 8211350072.

The previous prime is 16422881359. The next prime is 16422881407. The reversal of 16422881378 is 87318822461.

It can be written as a sum of positive squares in 2 ways, for example, as 8647698049 + 7775183329 = 92993^2 + 88177^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=90617.

It is a super-2 number, since 2×16422881378² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 135926 + ... + 226542.

Almost surely, 2^16422881378 is an apocalyptic number.

16422881378 is a deficient number, since it is larger than the sum of its proper divisors (8211712543).

16422881378 is an frugal number, since it uses more digits than its factorization.

16422881378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181236 (or 90619 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 50.

Multiplying 16422881378 by its sum of digits (50), we get a square (821144068900 = 906170²).

The spelling of 16422881378 in words is "sixteen billion, four hundred twenty-two million, eight hundred eighty-one thousand, three hundred seventy-eight".