25400042210431 has 4 divisors (see below), whose sum is σ = 29028619669072. Its totient is φ = 21771464751792.

The previous prime is 25400042210399. The next prime is 25400042210441. The reversal of 25400042210431 is 13401224000452.

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

It is not a de Polignac number, because 25400042210431 - 2⁵ = 25400042210399 is a prime.

It is a super-2 number, since 2×25400042210431² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25400042210431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25400042210441) 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, 1814288729310 + ... + 1814288729323.

It is an arithmetic number, because the mean of its divisors is an integer number (7257154917268).

Almost surely, 2^{25400042210431} is an apocalyptic number.

25400042210431 is a deficient number, since it is larger than the sum of its proper divisors (3628577458641).

25400042210431 is an equidigital number, since it uses as much as digits as its factorization.

25400042210431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3628577458640.

The product of its (nonzero) digits is 7680, while the sum is 28.

Adding to 25400042210431 its reverse (13401224000452), we get a palindrome (38801266210883).

The spelling of 25400042210431 in words is "twenty-five trillion, four hundred billion, forty-two million, two hundred ten thousand, four hundred thirty-one".