1366101661 has 2 divisors, whose sum is σ = 1366101662. Its totient is φ = 1366101660.

The previous prime is 1366101631. The next prime is 1366101703. The reversal of 1366101661 is 1661016631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1176901636 + 189200025 = 34306^2 + 13755^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366101661 - 2¹⁷ = 1365970589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366101631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683050830 + 683050831.

It is an arithmetic number, because the mean of its divisors is an integer number (683050831).

Almost surely, 2^1366101661 is an apocalyptic number.

It is an amenable number.

1366101661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366101661 is an equidigital number, since it uses as much as digits as its factorization.

1366101661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1366101661 is about 36960.8125045974. The cubic root of 1366101661 is about 1109.5860970673.

The spelling of 1366101661 in words is "one billion, three hundred sixty-six million, one hundred one thousand, six hundred sixty-one".