15445454449 has 2 divisors, whose sum is σ = 15445454450. Its totient is φ = 15445454448.

The previous prime is 15445454447. The next prime is 15445454461. The reversal of 15445454449 is 94445454451.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12823297600 + 2622156849 = 113240^2 + 51207^2 .

It is a cyclic number.

It is not a de Polignac number, because 15445454449 - 2¹ = 15445454447 is a prime.

It is a super-2 number, since 2×15445454449² (a number of 21 digits) contains 22 as substring.

Together with 15445454447, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (15445454447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7722727224 + 7722727225.

It is an arithmetic number, because the mean of its divisors is an integer number (7722727225).

Almost surely, 2^15445454449 is an apocalyptic number.

It is an amenable number.

15445454449 is a deficient number, since it is larger than the sum of its proper divisors (1).

15445454449 is an equidigital number, since it uses as much as digits as its factorization.

15445454449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608000, while the sum is 49.

The spelling of 15445454449 in words is "fifteen billion, four hundred forty-five million, four hundred fifty-four thousand, four hundred forty-nine".