136645400221573 has 2 divisors, whose sum is σ = 136645400221574. Its totient is φ = 136645400221572.

The previous prime is 136645400221541. The next prime is 136645400221639. The reversal of 136645400221573 is 375122004546631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 132117943982049 + 4527456239524 = 11494257^2 + 2127782^2 .

It is a cyclic number.

It is not a de Polignac number, because 136645400221573 - 2⁵ = 136645400221541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136645400221523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68322700110786 + 68322700110787.

It is an arithmetic number, because the mean of its divisors is an integer number (68322700110787).

Almost surely, 2^{136645400221573} is an apocalyptic number.

It is an amenable number.

136645400221573 is a deficient number, since it is larger than the sum of its proper divisors (1).

136645400221573 is an equidigital number, since it uses as much as digits as its factorization.

136645400221573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 136645400221573 in words is "one hundred thirty-six trillion, six hundred forty-five billion, four hundred million, two hundred twenty-one thousand, five hundred seventy-three".