25535021200 has 90 divisors (see below), whose sum is σ = 66430137894. Its totient is φ = 9428290560.

The previous prime is 25535021167. The next prime is 25535021219. The reversal of 25535021200 is 212053552.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 21279807376 + 4255213824 = 145876^2 + 65232^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 121269 + ... + 256468.

Almost surely, 2^25535021200 is an apocalyptic number.

25535021200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25535021200 is an abundant number, since it is smaller than the sum of its proper divisors (40895116694).

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

25535021200 is a wasteful number, since it uses less digits than its factorization.

25535021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377781 (or 377757 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

Adding to 25535021200 its reverse (212053552), we get a palindrome (25747074752).

The spelling of 25535021200 in words is "twenty-five billion, five hundred thirty-five million, twenty-one thousand, two hundred".