25217056563 has 8 divisors (see below), whose sum is σ = 34083327888. Its totient is φ = 16581078144.

The previous prime is 25217056559. The next prime is 25217056603. The reversal of 25217056563 is 36565071252.

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

It is not a de Polignac number, because 25217056563 - 2² = 25217056559 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25217056363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57572970 + ... + 57573407.

It is an arithmetic number, because the mean of its divisors is an integer number (4260415986).

Almost surely, 2^25217056563 is an apocalyptic number.

25217056563 is a deficient number, since it is larger than the sum of its proper divisors (8866271325).

25217056563 is a wasteful number, since it uses less digits than its factorization.

25217056563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115146453.

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 25217056563 in words is "twenty-five billion, two hundred seventeen million, fifty-six thousand, five hundred sixty-three".