25596754721 has 2 divisors, whose sum is σ = 25596754722.
Its totient is φ = 25596754720.
The previous prime is 25596754699. The next prime is 25596754727. The reversal of 25596754721 is 12745769552.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 25564492321 + 32262400 = 159889^2 + 5680^2
It is a cyclic number.
It is not a de Polignac number, because 25596754721 - 214 = 25596738337 is a prime.
It is a Sophie Germain prime.
It is a Curzon number.
It is not a weakly prime, because it can be changed into another prime (25596754727) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12798377360 + 12798377361.
It is an arithmetic number, because the mean of its divisors is an integer number (12798377361).
Almost surely, 225596754721 is an apocalyptic number.
It is an amenable number.
25596754721 is a deficient number, since it is larger than the sum of its proper divisors (1).
25596754721 is an equidigital number, since it uses as much as digits as its factorization.
25596754721 is an evil number, because the sum of its binary digits is even.
The product of its digits is 5292000, while the sum is 53.
The spelling of 25596754721 in words is "twenty-five billion, five hundred ninety-six million, seven hundred fifty-four thousand, seven hundred twenty-one".