2166521524 has 24 divisors (see below), whose sum is σ = 3958008768. Its totient is φ = 1035703680.

The previous prime is 2166521519. The next prime is 2166521543. The reversal of 2166521524 is 4251256612.

It is a self number, because there is not a number n which added to its sum of digits gives 2166521524.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 300684 + ... + 307804.

It is an arithmetic number, because the mean of its divisors is an integer number (164917032).

Almost surely, 2^2166521524 is an apocalyptic number.

It is an amenable number.

2166521524 is a deficient number, since it is larger than the sum of its proper divisors (1791487244).

2166521524 is a wasteful number, since it uses less digits than its factorization.

2166521524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10455 (or 10453 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The square root of 2166521524 is about 46545.9077041151. The cubic root of 2166521524 is about 1293.9604511466.

The spelling of 2166521524 in words is "two billion, one hundred sixty-six million, five hundred twenty-one thousand, five hundred twenty-four".