25488921197 has 8 divisors (see below), whose sum is σ = 25851828600. Its totient is φ = 25127714304.

The previous prime is 25488921181. The next prime is 25488921217. The reversal of 25488921197 is 79112988452.

It can be written as a sum of positive squares in 4 ways, for example, as 1592089801 + 23896831396 = 39901^2 + 154586^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 25488921197 - 2⁴ = 25488921181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25488921397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 394922 + ... + 454907.

It is an arithmetic number, because the mean of its divisors is an integer number (3231478575).

Almost surely, 2^25488921197 is an apocalyptic number.

It is an amenable number.

25488921197 is a deficient number, since it is larger than the sum of its proper divisors (362907403).

25488921197 is an equidigital number, since it uses as much as digits as its factorization.

25488921197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 850255.

The product of its digits is 2903040, while the sum is 56.

The spelling of 25488921197 in words is "twenty-five billion, four hundred eighty-eight million, nine hundred twenty-one thousand, one hundred ninety-seven".