15881171623441 has 2 divisors, whose sum is σ = 15881171623442. Its totient is φ = 15881171623440.

The previous prime is 15881171623439. The next prime is 15881171623453. The reversal of 15881171623441 is 14432617118851.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8511689550400 + 7369482073041 = 2917480^2 + 2714679^2 .

It is a cyclic number.

It is not a de Polignac number, because 15881171623441 - 2¹ = 15881171623439 is a prime.

It is a super-2 number, since 2×15881171623441² (a number of 27 digits) contains 22 as substring.

Together with 15881171623439, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15881171623481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7940585811720 + 7940585811721.

It is an arithmetic number, because the mean of its divisors is an integer number (7940585811721).

Almost surely, 2^{15881171623441} is an apocalyptic number.

It is an amenable number.

15881171623441 is a deficient number, since it is larger than the sum of its proper divisors (1).

15881171623441 is an equidigital number, since it uses as much as digits as its factorization.

15881171623441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1290240, while the sum is 52.

The spelling of 15881171623441 in words is "fifteen trillion, eight hundred eighty-one billion, one hundred seventy-one million, six hundred twenty-three thousand, four hundred forty-one".