25355534440 has 16 divisors (see below), whose sum is σ = 57049952580. Its totient is φ = 10142213760.

The previous prime is 25355534423. The next prime is 25355534467. The reversal of 25355534440 is 4443555352.

It can be written as a sum of positive squares in 2 ways, for example, as 25331268964 + 24265476 = 159158^2 + 4926^2 .

It is a super-2 number, since 2×25355534440² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 633888361 = 25355534440 / (2 + 5 + 3 + 5 + 5 + 5 + 3 + 4 + 4 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 25355534393 and 25355534402.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 316944141 + ... + 316944220.

Almost surely, 2^25355534440 is an apocalyptic number.

25355534440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25355534440 is an abundant number, since it is smaller than the sum of its proper divisors (31694418140).

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

25355534440 is a wasteful number, since it uses less digits than its factorization.

25355534440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 633888372 (or 633888368 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 40.

The spelling of 25355534440 in words is "twenty-five billion, three hundred fifty-five million, five hundred thirty-four thousand, four hundred forty".