17986716545 has 32 divisors (see below), whose sum is σ = 25585977600. Its totient is φ = 11876772096.

The previous prime is 17986716541. The next prime is 17986716547. The reversal of 17986716545 is 54561768971.

It is a happy number.

It is not a de Polignac number, because 17986716545 - 2² = 17986716541 is a prime.

It is not an unprimeable number, because it can be changed into a prime (17986716541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 361307 + ... + 408063.

It is an arithmetic number, because the mean of its divisors is an integer number (799561800).

Almost surely, 2^17986716545 is an apocalyptic number.

It is an amenable number.

17986716545 is a deficient number, since it is larger than the sum of its proper divisors (7599261055).

17986716545 is a wasteful number, since it uses less digits than its factorization.

17986716545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47177.

The product of its digits is 12700800, while the sum is 59.

The spelling of 17986716545 in words is "seventeen billion, nine hundred eighty-six million, seven hundred sixteen thousand, five hundred forty-five".