25440254419 has 4 divisors (see below), whose sum is σ = 25459720344. Its totient is φ = 25420788496.

The previous prime is 25440254417. The next prime is 25440254461. The reversal of 25440254419 is 91445204452.

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

It is a cyclic number.

It is not a de Polignac number, because 25440254419 - 2¹ = 25440254417 is a prime.

It is a super-2 number, since 2×25440254419² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25440254417) 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, 9731002 + ... + 9733615.

It is an arithmetic number, because the mean of its divisors is an integer number (6364930086).

Almost surely, 2^25440254419 is an apocalyptic number.

25440254419 is a deficient number, since it is larger than the sum of its proper divisors (19465925).

25440254419 is a wasteful number, since it uses less digits than its factorization.

25440254419 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19465924.

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 25440254419 in words is "twenty-five billion, four hundred forty million, two hundred fifty-four thousand, four hundred nineteen".