16442781049 has 2 divisors, whose sum is σ = 16442781050. Its totient is φ = 16442781048.

The previous prime is 16442781037. The next prime is 16442781067. The reversal of 16442781049 is 94018724461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10793755449 + 5649025600 = 103893^2 + 75160^2 .

It is a cyclic number.

It is not a de Polignac number, because 16442781049 - 2²³ = 16434392441 is a prime.

It is a super-3 number, since 3×16442781049³ (a number of 32 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (16442781749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8221390524 + 8221390525.

It is an arithmetic number, because the mean of its divisors is an integer number (8221390525).

Almost surely, 2^16442781049 is an apocalyptic number.

It is an amenable number.

16442781049 is a deficient number, since it is larger than the sum of its proper divisors (1).

16442781049 is an equidigital number, since it uses as much as digits as its factorization.

16442781049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 16442781049 in words is "sixteen billion, four hundred forty-two million, seven hundred eighty-one thousand, forty-nine".