19766867794097 has 2 divisors, whose sum is σ = 19766867794098. Its totient is φ = 19766867794096.

The previous prime is 19766867794061. The next prime is 19766867794117. The reversal of 19766867794097 is 79049776866791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16405424230321 + 3361443563776 = 4050361^2 + 1833424^2 .

It is an emirp because it is prime and its reverse (79049776866791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19766867794097 - 2²² = 19766863599793 is a prime.

It is not a weakly prime, because it can be changed into another prime (19766867794027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9883433897048 + 9883433897049.

It is an arithmetic number, because the mean of its divisors is an integer number (9883433897049).

Almost surely, 2^{19766867794097} is an apocalyptic number.

It is an amenable number.

19766867794097 is a deficient number, since it is larger than the sum of its proper divisors (1).

19766867794097 is an equidigital number, since it uses as much as digits as its factorization.

19766867794097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12098274048, while the sum is 86.

The spelling of 19766867794097 in words is "nineteen trillion, seven hundred sixty-six billion, eight hundred sixty-seven million, seven hundred ninety-four thousand, ninety-seven".