25034543640 has 320 divisors, whose sum is σ = 90255448800. Its totient is φ = 6204377088.

The previous prime is 25034543629. The next prime is 25034543701. The reversal of 25034543640 is 4634543052.

25034543640 is a `hidden beast` number, since 2 + 5 + 0 + 3 + 4 + 5 + 4 + 3 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 25034543595 and 25034543604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3258844 + ... + 3266516.

Almost surely, 2^25034543640 is an apocalyptic number.

25034543640 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 25034543640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45127724400).

25034543640 is an abundant number, since it is smaller than the sum of its proper divisors (65220905160).

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

25034543640 is a wasteful number, since it uses less digits than its factorization.

25034543640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7768 (or 7755 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 36.

The spelling of 25034543640 in words is "twenty-five billion, thirty-four million, five hundred forty-three thousand, six hundred forty".