25551749593 has 2 divisors, whose sum is σ = 25551749594. Its totient is φ = 25551749592.

The previous prime is 25551749579. The next prime is 25551749623. The reversal of 25551749593 is 39594715552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20855114569 + 4696635024 = 144413^2 + 68532^2 .

It is a cyclic number.

It is not a de Polignac number, because 25551749593 - 2²¹ = 25549652441 is a prime.

It is not a weakly prime, because it can be changed into another prime (25551749563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12775874796 + 12775874797.

It is an arithmetic number, because the mean of its divisors is an integer number (12775874797).

Almost surely, 2^25551749593 is an apocalyptic number.

It is an amenable number.

25551749593 is a deficient number, since it is larger than the sum of its proper divisors (1).

25551749593 is an equidigital number, since it uses as much as digits as its factorization.

25551749593 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8505000, while the sum is 55.

The spelling of 25551749593 in words is "twenty-five billion, five hundred fifty-one million, seven hundred forty-nine thousand, five hundred ninety-three".