25327991573 has 2 divisors, whose sum is σ = 25327991574. Its totient is φ = 25327991572.

The previous prime is 25327991561. The next prime is 25327991599. The reversal of 25327991573 is 37519972352.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25166015044 + 161976529 = 158638^2 + 12727^2 .

It is a cyclic number.

It is not a de Polignac number, because 25327991573 - 2¹⁶ = 25327926037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25327991543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12663995786 + 12663995787.

It is an arithmetic number, because the mean of its divisors is an integer number (12663995787).

Almost surely, 2^25327991573 is an apocalyptic number.

It is an amenable number.

25327991573 is a deficient number, since it is larger than the sum of its proper divisors (1).

25327991573 is an equidigital number, since it uses as much as digits as its factorization.

25327991573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3572100, while the sum is 53.

The spelling of 25327991573 in words is "twenty-five billion, three hundred twenty-seven million, nine hundred ninety-one thousand, five hundred seventy-three".