25216457285 has 4 divisors (see below), whose sum is σ = 30259748748. Its totient is φ = 20173165824.

The previous prime is 25216457243. The next prime is 25216457291. The reversal of 25216457285 is 58275461252.

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 18951101569 + 6265355716 = 137663^2 + 79154^2 .

It is a cyclic number.

It is not a de Polignac number, because 25216457285 - 2¹⁶ = 25216391749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2521645724 + ... + 2521645733.

It is an arithmetic number, because the mean of its divisors is an integer number (7564937187).

Almost surely, 2^25216457285 is an apocalyptic number.

It is an amenable number.

25216457285 is a deficient number, since it is larger than the sum of its proper divisors (5043291463).

25216457285 is an equidigital number, since it uses as much as digits as its factorization.

25216457285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5043291462.

The product of its digits is 1344000, while the sum is 47.

The spelling of 25216457285 in words is "twenty-five billion, two hundred sixteen million, four hundred fifty-seven thousand, two hundred eighty-five".