1361561384851 has 2 divisors, whose sum is σ = 1361561384852. Its totient is φ = 1361561384850.

The previous prime is 1361561384837. The next prime is 1361561384893. The reversal of 1361561384851 is 1584831651631.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1361561384851 - 2²⁵ = 1361527830419 is a prime.

It is not a weakly prime, because it can be changed into another prime (1361561384251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 680780692425 + 680780692426.

It is an arithmetic number, because the mean of its divisors is an integer number (680780692426).

Almost surely, 2^{1361561384851} is an apocalyptic number.

1361561384851 is a deficient number, since it is larger than the sum of its proper divisors (1).

1361561384851 is an equidigital number, since it uses as much as digits as its factorization.

1361561384851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2073600, while the sum is 52.

The spelling of 1361561384851 in words is "one trillion, three hundred sixty-one billion, five hundred sixty-one million, three hundred eighty-four thousand, eight hundred fifty-one".