25544540442 has 64 divisors (see below), whose sum is σ = 54995044608. Its totient is φ = 7881600000.

The previous prime is 25544540407. The next prime is 25544540447. The reversal of 25544540442 is 24404544552.

It is a self number, because there is not a number n which added to its sum of digits gives 25544540442.

It is not an unprimeable number, because it can be changed into a prime (25544540447) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1547392 + ... + 1563812.

It is an arithmetic number, because the mean of its divisors is an integer number (859297572).

Almost surely, 2^25544540442 is an apocalyptic number.

25544540442 is an abundant number, since it is smaller than the sum of its proper divisors (29450504166).

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

25544540442 is a wasteful number, since it uses less digits than its factorization.

25544540442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16695.

The product of its (nonzero) digits is 512000, while the sum is 39.

The spelling of 25544540442 in words is "twenty-five billion, five hundred forty-four million, five hundred forty thousand, four hundred forty-two".