25431220240 has 40 divisors (see below), whose sum is σ = 59937567768. Its totient is φ = 10033136640.

The previous prime is 25431220207. The next prime is 25431220273. The reversal of 25431220240 is 4202213452.

It is an interprime number because it is at equal distance from previous prime (25431220207) and next prime (25431220273).

It can be written as a sum of positive squares in 4 ways, for example, as 5200140544 + 20231079696 = 72112^2 + 142236^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 2171491 + ... + 2183170.

Almost surely, 2^25431220240 is an apocalyptic number.

25431220240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25431220240 is an abundant number, since it is smaller than the sum of its proper divisors (34506347528).

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

25431220240 is a wasteful number, since it uses less digits than its factorization.

25431220240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4354747 (or 4354741 counting only the distinct ones).

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

Adding to 25431220240 its reverse (4202213452), we get a palindrome (29633433692).

The spelling of 25431220240 in words is "twenty-five billion, four hundred thirty-one million, two hundred twenty thousand, two hundred forty".