19677370091 has 2 divisors, whose sum is σ = 19677370092. Its totient is φ = 19677370090.

The previous prime is 19677370039. The next prime is 19677370093. The reversal of 19677370091 is 19007377691.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (19007377691) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19677370091 is a prime.

Together with 19677370093, 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 (19677370093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9838685045 + 9838685046.

It is an arithmetic number, because the mean of its divisors is an integer number (9838685046).

Almost surely, 2^19677370091 is an apocalyptic number.

19677370091 is a deficient number, since it is larger than the sum of its proper divisors (1).

19677370091 is an equidigital number, since it uses as much as digits as its factorization.

19677370091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 500094, while the sum is 50.

The spelling of 19677370091 in words is "nineteen billion, six hundred seventy-seven million, three hundred seventy thousand, ninety-one".