11660061555 has 12 divisors (see below), whose sum is σ = 20210773440. Its totient is φ = 6218699472.

The previous prime is 11660061529. The next prime is 11660061571. The reversal of 11660061555 is 55516006611.

It is not a de Polignac number, because 11660061555 - 2⁹ = 11660061043 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129556195 + ... + 129556284.

It is an arithmetic number, because the mean of its divisors is an integer number (1684231120).

Almost surely, 2^11660061555 is an apocalyptic number.

11660061555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

11660061555 is a deficient number, since it is larger than the sum of its proper divisors (8550711885).

11660061555 is a wasteful number, since it uses less digits than its factorization.

11660061555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259112490 (or 259112487 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 11660061555 in words is "eleven billion, six hundred sixty million, sixty-one thousand, five hundred fifty-five".