25411678197 has 4 divisors (see below), whose sum is σ = 33882237600. Its totient is φ = 16941118796.

The previous prime is 25411678169. The next prime is 25411678199. The reversal of 25411678197 is 79187611452.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 25411678197 - 2¹⁰ = 25411677173 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25411678199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4235279697 + ... + 4235279702.

It is an arithmetic number, because the mean of its divisors is an integer number (8470559400).

Almost surely, 2^25411678197 is an apocalyptic number.

It is an amenable number.

25411678197 is a deficient number, since it is larger than the sum of its proper divisors (8470559403).

25411678197 is an equidigital number, since it uses as much as digits as its factorization.

25411678197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8470559402.

The product of its digits is 846720, while the sum is 51.

The spelling of 25411678197 in words is "twenty-five billion, four hundred eleven million, six hundred seventy-eight thousand, one hundred ninety-seven".