25220355535 has 16 divisors (see below), whose sum is σ = 30343723776. Its totient is φ = 20123486208.

The previous prime is 25220355533. The next prime is 25220355541. The reversal of 25220355535 is 53555302252.

It is a cyclic number.

It is not a de Polignac number, because 25220355535 - 2¹ = 25220355533 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25220355494 and 25220355503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25220355533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3957922 + ... + 3964288.

It is an arithmetic number, because the mean of its divisors is an integer number (1896482736).

Almost surely, 2^25220355535 is an apocalyptic number.

25220355535 is a deficient number, since it is larger than the sum of its proper divisors (5123368241).

25220355535 is a wasteful number, since it uses less digits than its factorization.

25220355535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8322.

The product of its (nonzero) digits is 225000, while the sum is 37.

Adding to 25220355535 its reverse (53555302252), we get a palindrome (78775657787).

The spelling of 25220355535 in words is "twenty-five billion, two hundred twenty million, three hundred fifty-five thousand, five hundred thirty-five".