25539401200 has 120 divisors (see below), whose sum is σ = 62117118000. Its totient is φ = 10090106880.

The previous prime is 25539401137. The next prime is 25539401263. The reversal of 25539401200 is 210493552.

It is an interprime number because it is at equal distance from previous prime (25539401137) and next prime (25539401263).

It is a super-2 number, since 2×25539401200² (a number of 22 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 15773991 + ... + 15775609.

It is an arithmetic number, because the mean of its divisors is an integer number (517642650).

Almost surely, 2^25539401200 is an apocalyptic number.

25539401200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25539401200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31058559000).

25539401200 is an abundant number, since it is smaller than the sum of its proper divisors (36577716800).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25539401200 is a wasteful number, since it uses less digits than its factorization.

25539401200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2099 (or 2088 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 25539401200 its reverse (210493552), we get a palindrome (25749894752).

The spelling of 25539401200 in words is "twenty-five billion, five hundred thirty-nine million, four hundred one thousand, two hundred".