25851173089 has 27 divisors (see below), whose sum is σ = 30503349873. Its totient is φ = 21844621512.

The previous prime is 25851173087. The next prime is 25851173137. The reversal of 25851173089 is 98037115852.

The square root of 25851173089 is 160783.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 25851173089 - 2¹ = 25851173087 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25851173087) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 115924432 + ... + 115924654.

It is an arithmetic number, because the mean of its divisors is an integer number (1129753699).

Almost surely, 2^25851173089 is an apocalyptic number.

25851173089 is the 160783-rd square number.

25851173089 is the 80392-nd centered octagonal number.

It is an amenable number.

25851173089 is a deficient number, since it is larger than the sum of its proper divisors (4652176784).

25851173089 is an frugal number, since it uses more digits than its factorization.

25851173089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 49.

Multiplying 25851173089 by its sum of digits (49), we get a square (1266707481361 = 1125481²).

25851173089 divided by its sum of digits (49) gives a square (527574961 = 22969²).

The spelling of 25851173089 in words is "twenty-five billion, eight hundred fifty-one million, one hundred seventy-three thousand, eighty-nine".