25545432440 has 32 divisors (see below), whose sum is σ = 62702426160. Its totient is φ = 9289248000.

The previous prime is 25545432439. The next prime is 25545432457. The reversal of 25545432440 is 4423454552.

It is a junction number, because it is equal to n+sod(n) for n = 25545432394 and 25545432403.

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, 29028461 + ... + 29029340.

Almost surely, 2^25545432440 is an apocalyptic number.

25545432440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25545432440 is an abundant number, since it is smaller than the sum of its proper divisors (37156993720).

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

25545432440 is a wasteful number, since it uses less digits than its factorization.

25545432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58057823 (or 58057819 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 38.

Adding to 25545432440 its reverse (4423454552), we get a palindrome (29968886992).

The spelling of 25545432440 in words is "twenty-five billion, five hundred forty-five million, four hundred thirty-two thousand, four hundred forty".