15666055506011 has 2 divisors, whose sum is σ = 15666055506012. Its totient is φ = 15666055506010.

The previous prime is 15666055505999. The next prime is 15666055506041. The reversal of 15666055506011 is 11060555066651.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15666055506011 is a prime.

It is not a weakly prime, because it can be changed into another prime (15666055506041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7833027753005 + 7833027753006.

It is an arithmetic number, because the mean of its divisors is an integer number (7833027753006).

Almost surely, 2^{15666055506011} is an apocalyptic number.

15666055506011 is a deficient number, since it is larger than the sum of its proper divisors (1).

15666055506011 is an equidigital number, since it uses as much as digits as its factorization.

15666055506011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810000, while the sum is 47.

The spelling of 15666055506011 in words is "fifteen trillion, six hundred sixty-six billion, fifty-five million, five hundred six thousand, eleven".