6664155811 has 2 divisors, whose sum is σ = 6664155812. Its totient is φ = 6664155810.

The previous prime is 6664155767. The next prime is 6664155829. The reversal of 6664155811 is 1185514666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6664155811 - 2¹¹ = 6664153763 is a prime.

It is not a weakly prime, because it can be changed into another prime (6664155011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3332077905 + 3332077906.

It is an arithmetic number, because the mean of its divisors is an integer number (3332077906).

Almost surely, 2^6664155811 is an apocalyptic number.

6664155811 is a deficient number, since it is larger than the sum of its proper divisors (1).

6664155811 is an equidigital number, since it uses as much as digits as its factorization.

6664155811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 43.

The square root of 6664155811 is about 81634.2808567577. The cubic root of 6664155811 is about 1881.8357475280.

The spelling of 6664155811 in words is "six billion, six hundred sixty-four million, one hundred fifty-five thousand, eight hundred eleven".