8047166218549 has 2 divisors, whose sum is σ = 8047166218550. Its totient is φ = 8047166218548.

The previous prime is 8047166218537. The next prime is 8047166218573. The reversal of 8047166218549 is 9458126617408.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8042856296049 + 4309922500 = 2835993^2 + 65650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8047166218549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8047166218249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4023583109274 + 4023583109275.

It is an arithmetic number, because the mean of its divisors is an integer number (4023583109275).

Almost surely, 2^{8047166218549} is an apocalyptic number.

It is an amenable number.

8047166218549 is a deficient number, since it is larger than the sum of its proper divisors (1).

8047166218549 is an equidigital number, since it uses as much as digits as its factorization.

8047166218549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23224320, while the sum is 61.

The spelling of 8047166218549 in words is "eight trillion, forty-seven billion, one hundred sixty-six million, two hundred eighteen thousand, five hundred forty-nine".