16961786861 has 4 divisors (see below), whose sum is σ = 16964029500. Its totient is φ = 16959544224.

The previous prime is 16961786843. The next prime is 16961786899. The reversal of 16961786861 is 16868716961.

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 141253225 + 16820533636 = 11885^2 + 129694^2 .

It is a cyclic number.

It is not a de Polignac number, because 16961786861 - 2³⁰ = 15888045037 is a prime.

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 16961786861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16966786861) 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, 1109936 + ... + 1125113.

It is an arithmetic number, because the mean of its divisors is an integer number (4241007375).

Almost surely, 2^16961786861 is an apocalyptic number.

It is an amenable number.

16961786861 is a deficient number, since it is larger than the sum of its proper divisors (2242639).

16961786861 is an equidigital number, since it uses as much as digits as its factorization.

16961786861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242638.

The product of its digits is 5225472, while the sum is 59.

The spelling of 16961786861 in words is "sixteen billion, nine hundred sixty-one million, seven hundred eighty-six thousand, eight hundred sixty-one".