25171567005505 has 4 divisors (see below), whose sum is σ = 30205880406612. Its totient is φ = 20137253604400.

The previous prime is 25171567005499. The next prime is 25171567005523. The reversal of 25171567005505 is 50550076517152.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5841545791041 + 19330021214464 = 2416929^2 + 4396592^2 .

It is not a de Polignac number, because 25171567005505 - 2²⁵ = 25171533451073 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2517156700546 + ... + 2517156700555.

It is an arithmetic number, because the mean of its divisors is an integer number (7551470101653).

Almost surely, 2^{25171567005505} is an apocalyptic number.

It is an amenable number.

25171567005505 is a deficient number, since it is larger than the sum of its proper divisors (5034313401107).

25171567005505 is an equidigital number, since it uses as much as digits as its factorization.

25171567005505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5034313401106.

The product of its (nonzero) digits is 1837500, while the sum is 49.

The spelling of 25171567005505 in words is "twenty-five trillion, one hundred seventy-one billion, five hundred sixty-seven million, five thousand, five hundred five".