13455773521 has 2 divisors, whose sum is σ = 13455773522. Its totient is φ = 13455773520.

The previous prime is 13455773509. The next prime is 13455773561. The reversal of 13455773521 is 12537755431.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11851370496 + 1604403025 = 108864^2 + 40055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13455773521 is a prime.

It is not a weakly prime, because it can be changed into another prime (13455773561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6727886760 + 6727886761.

It is an arithmetic number, because the mean of its divisors is an integer number (6727886761).

Almost surely, 2^13455773521 is an apocalyptic number.

It is an amenable number.

13455773521 is a deficient number, since it is larger than the sum of its proper divisors (1).

13455773521 is an equidigital number, since it uses as much as digits as its factorization.

13455773521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 441000, while the sum is 43.

The spelling of 13455773521 in words is "thirteen billion, four hundred fifty-five million, seven hundred seventy-three thousand, five hundred twenty-one".