16124436661 has 2 divisors, whose sum is σ = 16124436662. Its totient is φ = 16124436660.

The previous prime is 16124436613. The next prime is 16124436667. The reversal of 16124436661 is 16663442161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14955822436 + 1168614225 = 122294^2 + 34185^2 .

It is an emirp because it is prime and its reverse (16663442161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16124436661 - 2⁹ = 16124436149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16124436667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8062218330 + 8062218331.

It is an arithmetic number, because the mean of its divisors is an integer number (8062218331).

Almost surely, 2^16124436661 is an apocalyptic number.

It is an amenable number.

16124436661 is a deficient number, since it is larger than the sum of its proper divisors (1).

16124436661 is an equidigital number, since it uses as much as digits as its factorization.

16124436661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 40.

The spelling of 16124436661 in words is "sixteen billion, one hundred twenty-four million, four hundred thirty-six thousand, six hundred sixty-one".