25543737197640 has 192 divisors, whose sum is σ = 84261946354560. Its totient is φ = 6709539640320.

The previous prime is 25543737197579. The next prime is 25543737197683. The reversal of 25543737197640 is 4679173734552.

25543737197640 is a `hidden beast` number, since 2 + 5 + 5 + 437 + 3 + 7 + 197 + 6 + 4 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 494940717 + ... + 494992323.

It is an arithmetic number, because the mean of its divisors is an integer number (438864303930).

Almost surely, 2^{25543737197640} is an apocalyptic number.

25543737197640 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 25543737197640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42130973177280).

25543737197640 is an abundant number, since it is smaller than the sum of its proper divisors (58718209156920).

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

25543737197640 is a wasteful number, since it uses less digits than its factorization.

25543737197640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72212 (or 72205 counting only the distinct ones).

The product of its (nonzero) digits is 133358400, while the sum is 63.

The spelling of 25543737197640 in words is "twenty-five trillion, five hundred forty-three billion, seven hundred thirty-seven million, one hundred ninety-seven thousand, six hundred forty".