16990692281 has 4 divisors (see below), whose sum is σ = 17012673252. Its totient is φ = 16968711312.

The previous prime is 16990692269. The next prime is 16990692283. The reversal of 16990692281 is 18229609961.

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 2302464256 + 14688228025 = 47984^2 + 121195^2 .

It is a cyclic number.

It is not a de Polignac number, because 16990692281 - 2⁶ = 16990692217 is a prime.

It is a super-2 number, since 2×16990692281² (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 (16990692283) 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, 10989326 + ... + 10990871.

It is an arithmetic number, because the mean of its divisors is an integer number (4253168313).

Almost surely, 2^16990692281 is an apocalyptic number.

It is an amenable number.

16990692281 is a deficient number, since it is larger than the sum of its proper divisors (21980971).

16990692281 is an equidigital number, since it uses as much as digits as its factorization.

16990692281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21980970.

The product of its (nonzero) digits is 839808, while the sum is 53.

The spelling of 16990692281 in words is "sixteen billion, nine hundred ninety million, six hundred ninety-two thousand, two hundred eighty-one".