15926734478449 has 2 divisors, whose sum is σ = 15926734478450. Its totient is φ = 15926734478448.

The previous prime is 15926734478429. The next prime is 15926734478471. The reversal of 15926734478449 is 94487443762951.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10588125523600 + 5338608954849 = 3253940^2 + 2310543^2 .

It is an emirp because it is prime and its reverse (94487443762951) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15926734478449 - 2¹⁹ = 15926733954161 is a prime.

It is a super-2 number, since 2×15926734478449² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (15926734478429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7963367239224 + 7963367239225.

It is an arithmetic number, because the mean of its divisors is an integer number (7963367239225).

Almost surely, 2^{15926734478449} is an apocalyptic number.

It is an amenable number.

15926734478449 is a deficient number, since it is larger than the sum of its proper divisors (1).

15926734478449 is an equidigital number, since it uses as much as digits as its factorization.

15926734478449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1463132160, while the sum is 73.

The spelling of 15926734478449 in words is "fifteen trillion, nine hundred twenty-six billion, seven hundred thirty-four million, four hundred seventy-eight thousand, four hundred forty-nine".