16776886681 has 4 divisors (see below), whose sum is σ = 16791827152. Its totient is φ = 16761946212.

The previous prime is 16776886667. The next prime is 16776886723. The reversal of 16776886681 is 18668867761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16776886681 is a prime.

It is a super-2 number, since 2×16776886681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16776886661) 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, 7468551 + ... + 7470796.

It is an arithmetic number, because the mean of its divisors is an integer number (4197956788).

Almost surely, 2^16776886681 is an apocalyptic number.

It is an amenable number.

16776886681 is a deficient number, since it is larger than the sum of its proper divisors (14940471).

16776886681 is a wasteful number, since it uses less digits than its factorization.

16776886681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14940470.

The product of its digits is 32514048, while the sum is 64.

The spelling of 16776886681 in words is "sixteen billion, seven hundred seventy-six million, eight hundred eighty-six thousand, six hundred eighty-one".