16670407661 has 2 divisors, whose sum is σ = 16670407662. Its totient is φ = 16670407660.

The previous prime is 16670407619. The next prime is 16670407673.

16670407661 is nontrivially palindromic in base 10.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12248955625 + 4421452036 = 110675^2 + 66494^2 .

It is a palprime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16670407661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16670407601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8335203830 + 8335203831.

It is an arithmetic number, because the mean of its divisors is an integer number (8335203831).

Almost surely, 2^16670407661 is an apocalyptic number.

It is an amenable number.

16670407661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16670407661 is an equidigital number, since it uses as much as digits as its factorization.

16670407661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 44.

The spelling of 16670407661 in words is "sixteen billion, six hundred seventy million, four hundred seven thousand, six hundred sixty-one".