19766164091 has 2 divisors, whose sum is σ = 19766164092. Its totient is φ = 19766164090.

The previous prime is 19766164069. The next prime is 19766164139. The reversal of 19766164091 is 19046166791.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (19046166791) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19766164091 is a prime.

It is not a weakly prime, because it can be changed into another prime (19766164591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9883082045 + 9883082046.

It is an arithmetic number, because the mean of its divisors is an integer number (9883082046).

Almost surely, 2^19766164091 is an apocalyptic number.

19766164091 is a deficient number, since it is larger than the sum of its proper divisors (1).

19766164091 is an equidigital number, since it uses as much as digits as its factorization.

19766164091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 489888, while the sum is 50.

The spelling of 19766164091 in words is "nineteen billion, seven hundred sixty-six million, one hundred sixty-four thousand, ninety-one".