11611166571 has 12 divisors (see below), whose sum is σ = 16772666872. Its totient is φ = 7740324576.

The previous prime is 11611166569. The next prime is 11611166599. The reversal of 11611166571 is 17566111611.

It is a happy number.

11611166571 is a `hidden beast` number, since 1 + 16 + 1 + 11 + 66 + 571 = 666.

11611166571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11611166571 - 2¹ = 11611166569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11611166971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 210255 + ... + 259671.

Almost surely, 2^11611166571 is an apocalyptic number.

11611166571 is a deficient number, since it is larger than the sum of its proper divisors (5161500301).

11611166571 is a wasteful number, since it uses less digits than its factorization.

11611166571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75530 (or 75527 counting only the distinct ones).

The product of its digits is 7560, while the sum is 36.

The spelling of 11611166571 in words is "eleven billion, six hundred eleven million, one hundred sixty-six thousand, five hundred seventy-one".