25401432040 has 16 divisors (see below), whose sum is σ = 57153222180. Its totient is φ = 10160572800.

The previous prime is 25401432031. The next prime is 25401432083. The reversal of 25401432040 is 4023410452.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21116158596 + 4285273444 = 145314^2 + 65462^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25401431996 and 25401432014.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317517861 + ... + 317517940.

Almost surely, 2^25401432040 is an apocalyptic number.

25401432040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25401432040 is an abundant number, since it is smaller than the sum of its proper divisors (31751790140).

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

25401432040 is a wasteful number, since it uses less digits than its factorization.

25401432040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 635035812 (or 635035808 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 25.

Adding to 25401432040 its reverse (4023410452), we get a palindrome (29424842492).

The spelling of 25401432040 in words is "twenty-five billion, four hundred one million, four hundred thirty-two thousand, forty".