16171491887 has 2 divisors, whose sum is σ = 16171491888. Its totient is φ = 16171491886.

The previous prime is 16171491883. The next prime is 16171491929. The reversal of 16171491887 is 78819417161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16171491887 - 2² = 16171491883 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16171491883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8085745943 + 8085745944.

It is an arithmetic number, because the mean of its divisors is an integer number (8085745944).

Almost surely, 2^16171491887 is an apocalyptic number.

16171491887 is a deficient number, since it is larger than the sum of its proper divisors (1).

16171491887 is an equidigital number, since it uses as much as digits as its factorization.

16171491887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 53.

The spelling of 16171491887 in words is "sixteen billion, one hundred seventy-one million, four hundred ninety-one thousand, eight hundred eighty-seven".