16881986965 has 4 divisors (see below), whose sum is σ = 20258384364. Its totient is φ = 13505589568.

The previous prime is 16881986963. The next prime is 16881986971. The reversal of 16881986965 is 56968918861.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2743350129 + 14138636836 = 52377^2 + 118906^2 .

It is a cyclic number.

It is not a de Polignac number, because 16881986965 - 2¹ = 16881986963 is a prime.

It is a super-2 number, since 2×16881986965² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16881986965.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16881986963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1688198692 + ... + 1688198701.

It is an arithmetic number, because the mean of its divisors is an integer number (5064596091).

Almost surely, 2^16881986965 is an apocalyptic number.

It is an amenable number.

16881986965 is a deficient number, since it is larger than the sum of its proper divisors (3376397399).

16881986965 is an equidigital number, since it uses as much as digits as its factorization.

16881986965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3376397398.

The product of its digits is 44789760, while the sum is 67.

The spelling of 16881986965 in words is "sixteen billion, eight hundred eighty-one million, nine hundred eighty-six thousand, nine hundred sixty-five".