25642224651 has 8 divisors (see below), whose sum is σ = 34439192784. Its totient is φ = 16970036480.

The previous prime is 25642224581. The next prime is 25642224689. The reversal of 25642224651 is 15642224652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25642224651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (25642224691) 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 7 ways as a sum of consecutive naturals, for example, 31194510 + ... + 31195331.

It is an arithmetic number, because the mean of its divisors is an integer number (4304899098).

Almost surely, 2^25642224651 is an apocalyptic number.

25642224651 is a deficient number, since it is larger than the sum of its proper divisors (8796968133).

25642224651 is a wasteful number, since it uses less digits than its factorization.

25642224651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62389981.

The product of its digits is 230400, while the sum is 39.

Subtracting from 25642224651 its reverse (15642224652), we obtain a palindrome (9999999999).

The spelling of 25642224651 in words is "twenty-five billion, six hundred forty-two million, two hundred twenty-four thousand, six hundred fifty-one".