2166556529 has 4 divisors (see below), whose sum is σ = 2280585840. Its totient is φ = 2052527220.

The previous prime is 2166556519. The next prime is 2166556531. The reversal of 2166556529 is 9256556612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2166556529 - 2¹⁶ = 2166490993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166556519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57014627 + ... + 57014664.

It is an arithmetic number, because the mean of its divisors is an integer number (570146460).

Almost surely, 2^2166556529 is an apocalyptic number.

It is an amenable number.

2166556529 is a deficient number, since it is larger than the sum of its proper divisors (114029311).

2166556529 is a wasteful number, since it uses less digits than its factorization.

2166556529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114029310.

The product of its digits is 972000, while the sum is 47.

The square root of 2166556529 is about 46546.2837292087. The cubic root of 2166556529 is about 1293.9674200506.

The spelling of 2166556529 in words is "two billion, one hundred sixty-six million, five hundred fifty-six thousand, five hundred twenty-nine".