15445361561381 has 2 divisors, whose sum is σ = 15445361561382. Its totient is φ = 15445361561380.

The previous prime is 15445361561297. The next prime is 15445361561387. The reversal of 15445361561381 is 18316516354451.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15427934921281 + 17426640100 = 3927841^2 + 132010^2 .

It is a cyclic number.

It is not a de Polignac number, because 15445361561381 - 2³⁸ = 15170483654437 is a prime.

It is a super-2 number, since 2×15445361561381² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15445361561387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7722680780690 + 7722680780691.

It is an arithmetic number, because the mean of its divisors is an integer number (7722680780691).

Almost surely, 2^{15445361561381} is an apocalyptic number.

It is an amenable number.

15445361561381 is a deficient number, since it is larger than the sum of its proper divisors (1).

15445361561381 is an equidigital number, since it uses as much as digits as its factorization.

15445361561381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184000, while the sum is 53.

The spelling of 15445361561381 in words is "fifteen trillion, four hundred forty-five billion, three hundred sixty-one million, five hundred sixty-one thousand, three hundred eighty-one".