16518195971 has 2 divisors, whose sum is σ = 16518195972. Its totient is φ = 16518195970.

The previous prime is 16518195943. The next prime is 16518195983. The reversal of 16518195971 is 17959181561.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17959181561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16518195971 - 2¹⁸ = 16517933827 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16518195371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8259097985 + 8259097986.

It is an arithmetic number, because the mean of its divisors is an integer number (8259097986).

Almost surely, 2^16518195971 is an apocalyptic number.

16518195971 is a deficient number, since it is larger than the sum of its proper divisors (1).

16518195971 is an equidigital number, since it uses as much as digits as its factorization.

16518195971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 680400, while the sum is 53.

The spelling of 16518195971 in words is "sixteen billion, five hundred eighteen million, one hundred ninety-five thousand, nine hundred seventy-one".