25505542554 has 8 divisors (see below), whose sum is σ = 51011085120. Its totient is φ = 8501847516.

The previous prime is 25505542553. The next prime is 25505542597. The reversal of 25505542554 is 45524550552.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

25505542554 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (25505542553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2125461874 + ... + 2125461885.

It is an arithmetic number, because the mean of its divisors is an integer number (6376385640).

Almost surely, 2^25505542554 is an apocalyptic number.

25505542554 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

25505542554 is a wasteful number, since it uses less digits than its factorization.

25505542554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250923764.

The product of its (nonzero) digits is 1000000, while the sum is 42.

The spelling of 25505542554 in words is "twenty-five billion, five hundred five million, five hundred forty-two thousand, five hundred fifty-four".