19971018167 has 2 divisors, whose sum is σ = 19971018168. Its totient is φ = 19971018166.

The previous prime is 19971018149. The next prime is 19971018217. The reversal of 19971018167 is 76181017991.

It is an a-pointer prime, because the next prime (19971018217) can be obtained adding 19971018167 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19971018167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19971018127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9985509083 + 9985509084.

It is an arithmetic number, because the mean of its divisors is an integer number (9985509084).

Almost surely, 2^19971018167 is an apocalyptic number.

19971018167 is a deficient number, since it is larger than the sum of its proper divisors (1).

19971018167 is an equidigital number, since it uses as much as digits as its factorization.

19971018167 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 190512, while the sum is 50.

The spelling of 19971018167 in words is "nineteen billion, nine hundred seventy-one million, eighteen thousand, one hundred sixty-seven".