25551432550420 has 48 divisors (see below), whose sum is σ = 61336423709568. Its totient is φ = 8758636076160.

The previous prime is 25551432550409. The next prime is 25551432550429. The reversal of 25551432550420 is 2405523415552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25551432550429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18660211 + ... + 19982650.

It is an arithmetic number, because the mean of its divisors is an integer number (1277842160616).

Almost surely, 2^{25551432550420} is an apocalyptic number.

25551432550420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25551432550420 is an abundant number, since it is smaller than the sum of its proper divisors (35784991159148).

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

25551432550420 is a wasteful number, since it uses less digits than its factorization.

25551432550420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38647600 (or 38647598 counting only the distinct ones).

The product of its (nonzero) digits is 1200000, while the sum is 43.

Adding to 25551432550420 its reverse (2405523415552), we get a palindrome (27956955965972).

The spelling of 25551432550420 in words is "twenty-five trillion, five hundred fifty-one billion, four hundred thirty-two million, five hundred fifty thousand, four hundred twenty".