25517645457 has 8 divisors (see below), whose sum is σ = 34025078784. Its totient is φ = 17010987888.

The previous prime is 25517645453. The next prime is 25517645467. The reversal of 25517645457 is 75454671552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 25517645457 - 2² = 25517645453 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25517645453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112273 + ... + 252270.

It is an arithmetic number, because the mean of its divisors is an integer number (4253134848).

Almost surely, 2^25517645457 is an apocalyptic number.

It is an amenable number.

25517645457 is a deficient number, since it is larger than the sum of its proper divisors (8507433327).

25517645457 is a wasteful number, since it uses less digits than its factorization.

25517645457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387879.

The product of its digits is 5880000, while the sum is 51.

The spelling of 25517645457 in words is "twenty-five billion, five hundred seventeen million, six hundred forty-five thousand, four hundred fifty-seven".