16617197761 has 4 divisors (see below), whose sum is σ = 17066311252. Its totient is φ = 16168084272.

The previous prime is 16617197741. The next prime is 16617197767. The reversal of 16617197761 is 16779171661.

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 15608754225 + 1008443536 = 124935^2 + 31756^2 .

It is a cyclic number.

It is not a de Polignac number, because 16617197761 - 2³³ = 8027263169 is a prime.

It is a super-3 number, since 3×16617197761³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16617197699 and 16617197708.

It is not an unprimeable number, because it can be changed into a prime (16617197767) 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, 224556690 + ... + 224556763.

It is an arithmetic number, because the mean of its divisors is an integer number (4266577813).

Almost surely, 2^16617197761 is an apocalyptic number.

It is an amenable number.

16617197761 is a deficient number, since it is larger than the sum of its proper divisors (449113491).

16617197761 is an equidigital number, since it uses as much as digits as its factorization.

16617197761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449113490.

The product of its digits is 666792, while the sum is 52.

The spelling of 16617197761 in words is "sixteen billion, six hundred seventeen million, one hundred ninety-seven thousand, seven hundred sixty-one".