15504025743449 has 2 divisors, whose sum is σ = 15504025743450. Its totient is φ = 15504025743448.

The previous prime is 15504025743337. The next prime is 15504025743487. The reversal of 15504025743449 is 94434752040551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13267077760000 + 2236947983449 = 3642400^2 + 1495643^2 .

It is a cyclic number.

It is not a de Polignac number, because 15504025743449 - 2¹⁶ = 15504025677913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15504025743449.

It is not a weakly prime, because it can be changed into another prime (15504025743149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7752012871724 + 7752012871725.

It is an arithmetic number, because the mean of its divisors is an integer number (7752012871725).

Almost surely, 2^{15504025743449} is an apocalyptic number.

It is an amenable number.

15504025743449 is a deficient number, since it is larger than the sum of its proper divisors (1).

15504025743449 is an equidigital number, since it uses as much as digits as its factorization.

15504025743449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096000, while the sum is 53.

The spelling of 15504025743449 in words is "fifteen trillion, five hundred four billion, twenty-five million, seven hundred forty-three thousand, four hundred forty-nine".