25155320323207 has 4 divisors (see below), whose sum is σ = 25768864721376. Its totient is φ = 24541775925040.

The previous prime is 25155320323201. The next prime is 25155320323247. The reversal of 25155320323207 is 70232302355152.

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-25155320323207 is a prime.

It is a super-2 number, since 2×25155320323207² (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 25155320323207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25155320323201) 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, 306772199023 + ... + 306772199104.

It is an arithmetic number, because the mean of its divisors is an integer number (6442216180344).

Almost surely, 2^{25155320323207} is an apocalyptic number.

25155320323207 is a deficient number, since it is larger than the sum of its proper divisors (613544398169).

25155320323207 is an equidigital number, since it uses as much as digits as its factorization.

25155320323207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613544398168.

The product of its (nonzero) digits is 378000, while the sum is 40.

Adding to 25155320323207 its reverse (70232302355152), we get a palindrome (95387622678359).

The spelling of 25155320323207 in words is "twenty-five trillion, one hundred fifty-five billion, three hundred twenty million, three hundred twenty-three thousand, two hundred seven".