17986919051 has 2 divisors, whose sum is σ = 17986919052. Its totient is φ = 17986919050.

The previous prime is 17986919047. The next prime is 17986919059. The reversal of 17986919051 is 15091968971.

It is a weak prime.

It is an emirp because it is prime and its reverse (15091968971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 17986919051 - 2² = 17986919047 is a prime.

It is not a weakly prime, because it can be changed into another prime (17986919059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8993459525 + 8993459526.

It is an arithmetic number, because the mean of its divisors is an integer number (8993459526).

Almost surely, 2^17986919051 is an apocalyptic number.

17986919051 is a deficient number, since it is larger than the sum of its proper divisors (1).

17986919051 is an equidigital number, since it uses as much as digits as its factorization.

17986919051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 56.

The spelling of 17986919051 in words is "seventeen billion, nine hundred eighty-six million, nine hundred nineteen thousand, fifty-one".