25535543640 has 64 divisors (see below), whose sum is σ = 76699560960. Its totient is φ = 6801217920.

The previous prime is 25535543587. The next prime is 25535543641. The reversal of 25535543640 is 4634553552.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 25535543592 and 25535543601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25535543641) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 29416 + ... + 227895.

It is an arithmetic number, because the mean of its divisors is an integer number (1198430640).

Almost surely, 2^25535543640 is an apocalyptic number.

25535543640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25535543640 is an abundant number, since it is smaller than the sum of its proper divisors (51164017320).

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

25535543640 is a wasteful number, since it uses less digits than its factorization.

25535543640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258152 (or 258148 counting only the distinct ones).

The product of its (nonzero) digits is 1080000, while the sum is 42.

The spelling of 25535543640 in words is "twenty-five billion, five hundred thirty-five million, five hundred forty-three thousand, six hundred forty".