16244494778 has 4 divisors (see below), whose sum is σ = 24366742170. Its totient is φ = 8122247388.

The previous prime is 16244494727. The next prime is 16244494813. The reversal of 16244494778 is 87749444261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10271214409 + 5973280369 = 101347^2 + 77287^2 .

It is a super-2 number, since 2×16244494778² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4061123693 + ... + 4061123696.

Almost surely, 2^16244494778 is an apocalyptic number.

16244494778 is a deficient number, since it is larger than the sum of its proper divisors (8122247392).

16244494778 is an equidigital number, since it uses as much as digits as its factorization.

16244494778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8122247391.

The product of its digits is 10838016, while the sum is 56.

The spelling of 16244494778 in words is "sixteen billion, two hundred forty-four million, four hundred ninety-four thousand, seven hundred seventy-eight".