13332547661 has 2 divisors, whose sum is σ = 13332547662. Its totient is φ = 13332547660.

The previous prime is 13332547637. The next prime is 13332547717. The reversal of 13332547661 is 16674523331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13113685225 + 218862436 = 114515^2 + 14794^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13332547661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13332547861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6666273830 + 6666273831.

It is an arithmetic number, because the mean of its divisors is an integer number (6666273831).

Almost surely, 2^13332547661 is an apocalyptic number.

It is an amenable number.

13332547661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13332547661 is an equidigital number, since it uses as much as digits as its factorization.

13332547661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 41.

The spelling of 13332547661 in words is "thirteen billion, three hundred thirty-two million, five hundred forty-seven thousand, six hundred sixty-one".