25444016489 has 2 divisors, whose sum is σ = 25444016490. Its totient is φ = 25444016488.

The previous prime is 25444016473. The next prime is 25444016513. The reversal of 25444016489 is 98461044452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16794086464 + 8649930025 = 129592^2 + 93005^2 .

It is a cyclic number.

It is not a de Polignac number, because 25444016489 - 2⁴ = 25444016473 is a prime.

It is not a weakly prime, because it can be changed into another prime (25444016419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12722008244 + 12722008245.

It is an arithmetic number, because the mean of its divisors is an integer number (12722008245).

Almost surely, 2^25444016489 is an apocalyptic number.

It is an amenable number.

25444016489 is a deficient number, since it is larger than the sum of its proper divisors (1).

25444016489 is an equidigital number, since it uses as much as digits as its factorization.

25444016489 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1105920, while the sum is 47.

The spelling of 25444016489 in words is "twenty-five billion, four hundred forty-four million, sixteen thousand, four hundred eighty-nine".