25496197381 has 2 divisors, whose sum is σ = 25496197382. Its totient is φ = 25496197380.

The previous prime is 25496197379. The next prime is 25496197469. The reversal of 25496197381 is 18379169452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22677649281 + 2818548100 = 150591^2 + 53090^2 .

It is a cyclic number.

It is not a de Polignac number, because 25496197381 - 2¹ = 25496197379 is a prime.

It is a super-2 number, since 2×25496197381² (a number of 22 digits) contains 22 as substring.

Together with 25496197379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25496197361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12748098690 + 12748098691.

It is an arithmetic number, because the mean of its divisors is an integer number (12748098691).

Almost surely, 2^25496197381 is an apocalyptic number.

It is an amenable number.

25496197381 is a deficient number, since it is larger than the sum of its proper divisors (1).

25496197381 is an equidigital number, since it uses as much as digits as its factorization.

25496197381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 55.

The spelling of 25496197381 in words is "twenty-five billion, four hundred ninety-six million, one hundred ninety-seven thousand, three hundred eighty-one".