2151668899 has 2 divisors, whose sum is σ = 2151668900. Its totient is φ = 2151668898.

The previous prime is 2151668839. The next prime is 2151668933. The reversal of 2151668899 is 9988661512.

2151668899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2151668899 is a prime.

It is not a weakly prime, because it can be changed into another prime (2151668819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075834449 + 1075834450.

It is an arithmetic number, because the mean of its divisors is an integer number (1075834450).

Almost surely, 2^2151668899 is an apocalyptic number.

2151668899 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151668899 is an equidigital number, since it uses as much as digits as its factorization.

2151668899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1866240, while the sum is 55.

The square root of 2151668899 is about 46386.0851872628. The cubic root of 2151668899 is about 1290.9967456198.

The spelling of 2151668899 in words is "two billion, one hundred fifty-one million, six hundred sixty-eight thousand, eight hundred ninety-nine".