25220003531 has 4 divisors (see below), whose sum is σ = 26033552064. Its totient is φ = 24406455000.

The previous prime is 25220003477. The next prime is 25220003617. The reversal of 25220003531 is 13530002252.

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

It is not a de Polignac number, because 25220003531 - 2¹⁸ = 25219741387 is a prime.

It is a super-2 number, since 2×25220003531² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25220003497 and 25220003506.

It is not an unprimeable number, because it can be changed into a prime (25220002531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406774220 + ... + 406774281.

It is an arithmetic number, because the mean of its divisors is an integer number (6508388016).

Almost surely, 2^25220003531 is an apocalyptic number.

25220003531 is a deficient number, since it is larger than the sum of its proper divisors (813548533).

25220003531 is an equidigital number, since it uses as much as digits as its factorization.

25220003531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813548532.

The product of its (nonzero) digits is 1800, while the sum is 23.

Adding to 25220003531 its reverse (13530002252), we get a palindrome (38750005783).

The spelling of 25220003531 in words is "twenty-five billion, two hundred twenty million, three thousand, five hundred thirty-one".