208192745877491 has 2 divisors, whose sum is σ = 208192745877492. Its totient is φ = 208192745877490.

The previous prime is 208192745877469. The next prime is 208192745877509. The reversal of 208192745877491 is 194778547291802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208192745877491 - 2⁴⁶ = 137824001699827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (208192745877421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104096372938745 + 104096372938746.

It is an arithmetic number, because the mean of its divisors is an integer number (104096372938746).

Almost surely, 2^{208192745877491} is an apocalyptic number.

208192745877491 is a deficient number, since it is larger than the sum of its proper divisors (1).

208192745877491 is an equidigital number, since it uses as much as digits as its factorization.

208192745877491 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 568995840, while the sum is 74.

The spelling of 208192745877491 in words is "two hundred eight trillion, one hundred ninety-two billion, seven hundred forty-five million, eight hundred seventy-seven thousand, four hundred ninety-one".