1368834661 has 2 divisors, whose sum is σ = 1368834662. Its totient is φ = 1368834660.

The previous prime is 1368834641. The next prime is 1368834683. The reversal of 1368834661 is 1664388631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1211457636 + 157377025 = 34806^2 + 12545^2 .

It is an emirp because it is prime and its reverse (1664388631) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1368834661 - 2¹¹ = 1368832613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1368834641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 684417330 + 684417331.

It is an arithmetic number, because the mean of its divisors is an integer number (684417331).

Almost surely, 2^1368834661 is an apocalyptic number.

It is an amenable number.

1368834661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1368834661 is an equidigital number, since it uses as much as digits as its factorization.

1368834661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The square root of 1368834661 is about 36997.7656217237. The cubic root of 1368834661 is about 1110.3255439374.

The spelling of 1368834661 in words is "one billion, three hundred sixty-eight million, eight hundred thirty-four thousand, six hundred sixty-one".