2166187297 has 4 divisors (see below), whose sum is σ = 2166342336. Its totient is φ = 2166032260.

The previous prime is 2166187291. The next prime is 2166187319. The reversal of 2166187297 is 7927816612.

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 a de Polignac number, because none of the positive numbers 2^k-2166187297 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166187297.

It is not an unprimeable number, because it can be changed into a prime (2166187291) 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, 54229 + ... + 85282.

It is an arithmetic number, because the mean of its divisors is an integer number (541585584).

Almost surely, 2^2166187297 is an apocalyptic number.

It is an amenable number.

2166187297 is a deficient number, since it is larger than the sum of its proper divisors (155039).

2166187297 is a wasteful number, since it uses less digits than its factorization.

2166187297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155038.

The product of its digits is 508032, while the sum is 49.

The square root of 2166187297 is about 46542.3172714896. The cubic root of 2166187297 is about 1293.8939084180.

The spelling of 2166187297 in words is "two billion, one hundred sixty-six million, one hundred eighty-seven thousand, two hundred ninety-seven".