25545152321 has 4 divisors (see below), whose sum is σ = 27510164052. Its totient is φ = 23580140592.

The previous prime is 25545152317. The next prime is 25545152359. The reversal of 25545152321 is 12325154552.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 14232490000 + 11312662321 = 119300^2 + 106361^2 .

It is a cyclic number.

It is not a de Polignac number, because 25545152321 - 2² = 25545152317 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25545152621) 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, 982505846 + ... + 982505871.

It is an arithmetic number, because the mean of its divisors is an integer number (6877541013).

Almost surely, 2^25545152321 is an apocalyptic number.

It is an amenable number.

25545152321 is a deficient number, since it is larger than the sum of its proper divisors (1965011731).

25545152321 is a wasteful number, since it uses less digits than its factorization.

25545152321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1965011730.

The product of its digits is 60000, while the sum is 35.

The spelling of 25545152321 in words is "twenty-five billion, five hundred forty-five million, one hundred fifty-two thousand, three hundred twenty-one".