25802452019 has 4 divisors (see below), whose sum is σ = 25805057520. Its totient is φ = 25799846520.

The previous prime is 25802452009. The next prime is 25802452033. The reversal of 25802452019 is 91025420852.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25802452019 is a prime.

It is a super-2 number, since 2×25802452019² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25802452009) 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, 1287839 + ... + 1307720.

It is an arithmetic number, because the mean of its divisors is an integer number (6451264380).

Almost surely, 2^25802452019 is an apocalyptic number.

25802452019 is a deficient number, since it is larger than the sum of its proper divisors (2605501).

25802452019 is an equidigital number, since it uses as much as digits as its factorization.

25802452019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2605500.

The product of its (nonzero) digits is 57600, while the sum is 38.

The spelling of 25802452019 in words is "twenty-five billion, eight hundred two million, four hundred fifty-two thousand, nineteen".