2157996899 has 2 divisors, whose sum is σ = 2157996900. Its totient is φ = 2157996898.

The previous prime is 2157996853. The next prime is 2157996901. The reversal of 2157996899 is 9986997512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2157996899 - 2²⁰ = 2156948323 is a prime.

Together with 2157996901, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2157996809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1078998449 + 1078998450.

It is an arithmetic number, because the mean of its divisors is an integer number (1078998450).

Almost surely, 2^2157996899 is an apocalyptic number.

2157996899 is a deficient number, since it is larger than the sum of its proper divisors (1).

2157996899 is an equidigital number, since it uses as much as digits as its factorization.

2157996899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22044960, while the sum is 65.

The square root of 2157996899 is about 46454.2452204317. The cubic root of 2157996899 is about 1292.2611024455.

The spelling of 2157996899 in words is "two billion, one hundred fifty-seven million, nine hundred ninety-six thousand, eight hundred ninety-nine".