25767321361 has 2 divisors, whose sum is σ = 25767321362. Its totient is φ = 25767321360.

The previous prime is 25767321347. The next prime is 25767321389. The reversal of 25767321361 is 16312376752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23822070336 + 1945251025 = 154344^2 + 44105^2 .

It is a cyclic number.

It is not a de Polignac number, because 25767321361 - 2¹⁵ = 25767288593 is a prime.

It is not a weakly prime, because it can be changed into another prime (25767321301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12883660680 + 12883660681.

It is an arithmetic number, because the mean of its divisors is an integer number (12883660681).

Almost surely, 2^25767321361 is an apocalyptic number.

It is an amenable number.

25767321361 is a deficient number, since it is larger than the sum of its proper divisors (1).

25767321361 is an equidigital number, since it uses as much as digits as its factorization.

25767321361 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317520, while the sum is 43.

The spelling of 25767321361 in words is "twenty-five billion, seven hundred sixty-seven million, three hundred twenty-one thousand, three hundred sixty-one".