2166601025539 has 32 divisors (see below), whose sum is σ = 2320548796800. Its totient is φ = 2019569448960.

The previous prime is 2166601025507. The next prime is 2166601025543. The reversal of 2166601025539 is 9355201066612.

It is a cyclic number.

It is not a de Polignac number, because 2166601025539 - 2⁵ = 2166601025507 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166601025339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20536777 + ... + 20642005.

It is an arithmetic number, because the mean of its divisors is an integer number (72517149900).

Almost surely, 2^{2166601025539} is an apocalyptic number.

2166601025539 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2166601025539 is a deficient number, since it is larger than the sum of its proper divisors (153947771261).

2166601025539 is a wasteful number, since it uses less digits than its factorization.

2166601025539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105535.

The product of its (nonzero) digits is 583200, while the sum is 46.

The spelling of 2166601025539 in words is "two trillion, one hundred sixty-six billion, six hundred one million, twenty-five thousand, five hundred thirty-nine".