25543200987 has 8 divisors (see below), whose sum is σ = 37841779280. Its totient is φ = 17028800640.

The previous prime is 25543200973. The next prime is 25543200989. The reversal of 25543200987 is 78900234552.

25543200987 is a `hidden beast` number, since 2 + 5 + 543 + 20 + 0 + 9 + 87 = 666.

It is not a de Polignac number, because 25543200987 - 2¹² = 25543196891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25543200989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473022214 + ... + 473022267.

It is an arithmetic number, because the mean of its divisors is an integer number (4730222410).

Almost surely, 2^25543200987 is an apocalyptic number.

25543200987 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

25543200987 is a deficient number, since it is larger than the sum of its proper divisors (12298578293).

25543200987 is an equidigital number, since it uses as much as digits as its factorization.

25543200987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946044490 (or 946044484 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 25543200987 in words is "twenty-five billion, five hundred forty-three million, two hundred thousand, nine hundred eighty-seven".