25401305540 has 24 divisors (see below), whose sum is σ = 57446030040. Its totient is φ = 9378943488.

The previous prime is 25401305537. The next prime is 25401305569. The reversal of 25401305540 is 4550310452.

It can be written as a sum of positive squares in 4 ways, for example, as 1285079104 + 24116226436 = 35848^2 + 155294^2 .

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, 48848405 + ... + 48848924.

It is an arithmetic number, because the mean of its divisors is an integer number (2393584585).

Almost surely, 2^25401305540 is an apocalyptic number.

25401305540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25401305540 is an abundant number, since it is smaller than the sum of its proper divisors (32044724500).

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

25401305540 is a wasteful number, since it uses less digits than its factorization.

25401305540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97697351 (or 97697349 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

Adding to 25401305540 its reverse (4550310452), we get a palindrome (29951615992).

The spelling of 25401305540 in words is "twenty-five billion, four hundred one million, three hundred five thousand, five hundred forty".