16051778 has 6 divisors (see below), whose sum is σ = 24086169. Its totient is φ = 8023056.

The previous prime is 16051759. The next prime is 16051781. The reversal of 16051778 is 87715061.

It can be written as a sum of positive squares in 2 ways, for example, as 15864289 + 187489 = 3983^2 + 433^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=2833.

It is a super-2 number, since 2×16051778² = 515319153922568, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 2 ways as a sum of consecutive naturals, for example, 4250 + ... + 7082.

Almost surely, 2^16051778 is an apocalyptic number.

16051778 is a deficient number, since it is larger than the sum of its proper divisors (8034391).

16051778 is an frugal number, since it uses more digits than its factorization.

16051778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5668 (or 2835 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 16051778 is about 4006.4670222030. The cubic root of 16051778 is about 252.2557347604.

The spelling of 16051778 in words is "sixteen million, fifty-one thousand, seven hundred seventy-eight".