25401135215 has 4 divisors (see below), whose sum is σ = 30481362264. Its totient is φ = 20320908168.

The previous prime is 25401135211. The next prime is 25401135257. The reversal of 25401135215 is 51253110452.

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 25401135215 - 2² = 25401135211 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 (25401135211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2540113517 + ... + 2540113526.

It is an arithmetic number, because the mean of its divisors is an integer number (7620340566).

Almost surely, 2^25401135215 is an apocalyptic number.

25401135215 is a deficient number, since it is larger than the sum of its proper divisors (5080227049).

25401135215 is an equidigital number, since it uses as much as digits as its factorization.

25401135215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5080227048.

The product of its (nonzero) digits is 6000, while the sum is 29.

Adding to 25401135215 its reverse (51253110452), we get a palindrome (76654245667).

The spelling of 25401135215 in words is "twenty-five billion, four hundred one million, one hundred thirty-five thousand, two hundred fifteen".