25505144540 has 24 divisors (see below), whose sum is σ = 56711439792. Its totient is φ = 9601936640.

The previous prime is 25505144531. The next prime is 25505144563. The reversal of 25505144540 is 4544150552.

It is a self number, because there is not a number n which added to its sum of digits gives 25505144540.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37507226 + ... + 37507905.

It is an arithmetic number, because the mean of its divisors is an integer number (2362976658).

Almost surely, 2^25505144540 is an apocalyptic number.

25505144540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25505144540 is an abundant number, since it is smaller than the sum of its proper divisors (31206295252).

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

25505144540 is a wasteful number, since it uses less digits than its factorization.

25505144540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75015157 (or 75015155 counting only the distinct ones).

The product of its (nonzero) digits is 80000, while the sum is 35.

The spelling of 25505144540 in words is "twenty-five billion, five hundred five million, one hundred forty-four thousand, five hundred forty".