1366513753261 has 2 divisors, whose sum is σ = 1366513753262. Its totient is φ = 1366513753260.

The previous prime is 1366513753247. The next prime is 1366513753279. The reversal of 1366513753261 is 1623573156631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1226791051236 + 139722702025 = 1107606^2 + 373795^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366513753261 - 2⁹ = 1366513752749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366513733261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683256876630 + 683256876631.

It is an arithmetic number, because the mean of its divisors is an integer number (683256876631).

Almost surely, 2^{1366513753261} is an apocalyptic number.

It is an amenable number.

1366513753261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366513753261 is an equidigital number, since it uses as much as digits as its factorization.

1366513753261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2041200, while the sum is 49.

The spelling of 1366513753261 in words is "one trillion, three hundred sixty-six billion, five hundred thirteen million, seven hundred fifty-three thousand, two hundred sixty-one".