25213510450523 has 4 divisors (see below), whose sum is σ = 26540537316360. Its totient is φ = 23886483584688.

The previous prime is 25213510450517. The next prime is 25213510450619. The reversal of 25213510450523 is 32505401531252.

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 25213510450523 - 2¹⁸ = 25213510188379 is a prime.

It is a super-2 number, since 2×25213510450523² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25213510450123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663513432890 + ... + 663513432927.

It is an arithmetic number, because the mean of its divisors is an integer number (6635134329090).

Almost surely, 2^{25213510450523} is an apocalyptic number.

25213510450523 is a deficient number, since it is larger than the sum of its proper divisors (1327026865837).

25213510450523 is a wasteful number, since it uses less digits than its factorization.

25213510450523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1327026865836.

The product of its (nonzero) digits is 180000, while the sum is 38.

Adding to 25213510450523 its reverse (32505401531252), we get a palindrome (57718911981775).

The spelling of 25213510450523 in words is "twenty-five trillion, two hundred thirteen billion, five hundred ten million, four hundred fifty thousand, five hundred twenty-three".