1366610257391 has 2 divisors, whose sum is σ = 1366610257392. Its totient is φ = 1366610257390.

The previous prime is 1366610257367. The next prime is 1366610257403. The reversal of 1366610257391 is 1937520166631.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1366610257391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1366610257351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683305128695 + 683305128696.

It is an arithmetic number, because the mean of its divisors is an integer number (683305128696).

Almost surely, 2^{1366610257391} is an apocalyptic number.

1366610257391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366610257391 is an equidigital number, since it uses as much as digits as its factorization.

1366610257391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 1366610257391 in words is "one trillion, three hundred sixty-six billion, six hundred ten million, two hundred fifty-seven thousand, three hundred ninety-one".