25520653603 has 4 divisors (see below), whose sum is σ = 25545650368. Its totient is φ = 25495656840.

The previous prime is 25520653597. The next prime is 25520653607. The reversal of 25520653603 is 30635602552.

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 25520653603 - 2⁹ = 25520653091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25520653607) 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, 12496851 + ... + 12498892.

It is an arithmetic number, because the mean of its divisors is an integer number (6386412592).

Almost surely, 2^25520653603 is an apocalyptic number.

25520653603 is a deficient number, since it is larger than the sum of its proper divisors (24996765).

25520653603 is a wasteful number, since it uses less digits than its factorization.

25520653603 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24996764.

The product of its (nonzero) digits is 162000, while the sum is 37.

The spelling of 25520653603 in words is "twenty-five billion, five hundred twenty million, six hundred fifty-three thousand, six hundred three".