16231878197 has 2 divisors, whose sum is σ = 16231878198. Its totient is φ = 16231878196.

The previous prime is 16231878193. The next prime is 16231878199. The reversal of 16231878197 is 79187813261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14275231441 + 1956646756 = 119479^2 + 44234^2 .

It is a cyclic number.

It is not a de Polignac number, because 16231878197 - 2² = 16231878193 is a prime.

Together with 16231878199, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16231878191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8115939098 + 8115939099.

It is an arithmetic number, because the mean of its divisors is an integer number (8115939099).

Almost surely, 2^16231878197 is an apocalyptic number.

It is an amenable number.

16231878197 is a deficient number, since it is larger than the sum of its proper divisors (1).

16231878197 is an equidigital number, since it uses as much as digits as its factorization.

16231878197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The spelling of 16231878197 in words is "sixteen billion, two hundred thirty-one million, eight hundred seventy-eight thousand, one hundred ninety-seven".