16115569437749 has 2 divisors, whose sum is σ = 16115569437750. Its totient is φ = 16115569437748.

The previous prime is 16115569437739. The next prime is 16115569437833. The reversal of 16115569437749 is 94773496551161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9518798415025 + 6596771022724 = 3085255^2 + 2568418^2 .

It is a cyclic number.

It is not a de Polignac number, because 16115569437749 - 2⁸ = 16115569437493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16115569437739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8057784718874 + 8057784718875.

It is an arithmetic number, because the mean of its divisors is an integer number (8057784718875).

Almost surely, 2^{16115569437749} is an apocalyptic number.

It is an amenable number.

16115569437749 is a deficient number, since it is larger than the sum of its proper divisors (1).

16115569437749 is an equidigital number, since it uses as much as digits as its factorization.

16115569437749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 171460800, while the sum is 68.

The spelling of 16115569437749 in words is "sixteen trillion, one hundred fifteen billion, five hundred sixty-nine million, four hundred thirty-seven thousand, seven hundred forty-nine".