19220718409987 has 2 divisors, whose sum is σ = 19220718409988. Its totient is φ = 19220718409986.

The previous prime is 19220718409943. The next prime is 19220718410093. The reversal of 19220718409987 is 78990481702291.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19220718409987 is a prime.

It is not a weakly prime, because it can be changed into another prime (19220718409187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9610359204993 + 9610359204994.

It is an arithmetic number, because the mean of its divisors is an integer number (9610359204994).

Almost surely, 2^{19220718409987} is an apocalyptic number.

19220718409987 is a deficient number, since it is larger than the sum of its proper divisors (1).

19220718409987 is an equidigital number, since it uses as much as digits as its factorization.

19220718409987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36578304, while the sum is 67.

The spelling of 19220718409987 in words is "nineteen trillion, two hundred twenty billion, seven hundred eighteen million, four hundred nine thousand, nine hundred eighty-seven".