25480021571 has 4 divisors (see below), whose sum is σ = 25484038632. Its totient is φ = 25476004512.

The previous prime is 25480021517. The next prime is 25480021577. The reversal of 25480021571 is 17512008452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25480021571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25480021577) 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 3 ways as a sum of consecutive naturals, for example, 1999001 + ... + 2011706.

It is an arithmetic number, because the mean of its divisors is an integer number (6371009658).

Almost surely, 2^25480021571 is an apocalyptic number.

25480021571 is a deficient number, since it is larger than the sum of its proper divisors (4017061).

25480021571 is an equidigital number, since it uses as much as digits as its factorization.

25480021571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4017060.

The product of its (nonzero) digits is 22400, while the sum is 35.

The spelling of 25480021571 in words is "twenty-five billion, four hundred eighty million, twenty-one thousand, five hundred seventy-one".