25501242452431 has 4 divisors (see below), whose sum is σ = 25501263660712. Its totient is φ = 25501221244152.

The previous prime is 25501242452351. The next prime is 25501242452443. The reversal of 25501242452431 is 13425424210552.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25501242452431 is a prime.

It is a super-2 number, since 2×25501242452431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25501242452461) 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, 8684700 + ... + 11243953.

It is an arithmetic number, because the mean of its divisors is an integer number (6375315915178).

Almost surely, 2^{25501242452431} is an apocalyptic number.

25501242452431 is a deficient number, since it is larger than the sum of its proper divisors (21208281).

25501242452431 is a wasteful number, since it uses less digits than its factorization.

25501242452431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21208280.

The product of its (nonzero) digits is 384000, while the sum is 40.

Adding to 25501242452431 its reverse (13425424210552), we get a palindrome (38926666662983).

The spelling of 25501242452431 in words is "twenty-five trillion, five hundred one billion, two hundred forty-two million, four hundred fifty-two thousand, four hundred thirty-one".