16564718986 has 4 divisors (see below), whose sum is σ = 24847078482. Its totient is φ = 8282359492.

The previous prime is 16564718983. The next prime is 16564718993. The reversal of 16564718986 is 68981746561.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 12991668361 + 3573050625 = 113981^2 + 59775^2 .

It is not an unprimeable number, because it can be changed into a prime (16564718983) 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, 4141179745 + ... + 4141179748.

Almost surely, 2^16564718986 is an apocalyptic number.

16564718986 is a deficient number, since it is larger than the sum of its proper divisors (8282359496).

16564718986 is an equidigital number, since it uses as much as digits as its factorization.

16564718986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8282359495.

The product of its digits is 17418240, while the sum is 61.

The spelling of 16564718986 in words is "sixteen billion, five hundred sixty-four million, seven hundred eighteen thousand, nine hundred eighty-six".