25767321389 has 2 divisors, whose sum is σ = 25767321390. Its totient is φ = 25767321388.

The previous prime is 25767321361. The next prime is 25767321397. The reversal of 25767321389 is 98312376752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21299067364 + 4468254025 = 145942^2 + 66845^2 .

It is a cyclic number.

It is not a de Polignac number, because 25767321389 - 2¹² = 25767317293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 25767321389.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25767311389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12883660694 + 12883660695.

It is an arithmetic number, because the mean of its divisors is an integer number (12883660695).

Almost surely, 2^25767321389 is an apocalyptic number.

It is an amenable number.

25767321389 is a deficient number, since it is larger than the sum of its proper divisors (1).

25767321389 is an equidigital number, since it uses as much as digits as its factorization.

25767321389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3810240, while the sum is 53.

The spelling of 25767321389 in words is "twenty-five billion, seven hundred sixty-seven million, three hundred twenty-one thousand, three hundred eighty-nine".