25006645457 has 2 divisors, whose sum is σ = 25006645458. Its totient is φ = 25006645456.

The previous prime is 25006645453. The next prime is 25006645459. The reversal of 25006645457 is 75454660052.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20233355536 + 4773289921 = 142244^2 + 69089^2 .

It is a cyclic number.

It is not a de Polignac number, because 25006645457 - 2² = 25006645453 is a prime.

Together with 25006645459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (25006645453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12503322728 + 12503322729.

It is an arithmetic number, because the mean of its divisors is an integer number (12503322729).

Almost surely, 2^25006645457 is an apocalyptic number.

It is an amenable number.

25006645457 is a deficient number, since it is larger than the sum of its proper divisors (1).

25006645457 is an equidigital number, since it uses as much as digits as its factorization.

25006645457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008000, while the sum is 44.

The spelling of 25006645457 in words is "twenty-five billion, six million, six hundred forty-five thousand, four hundred fifty-seven".