25212004040 has 64 divisors (see below), whose sum is σ = 57547067760. Its totient is φ = 9940008960.

The previous prime is 25212004009. The next prime is 25212004049. The reversal of 25212004040 is 4040021252.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1467043204 + 23744960836 = 38302^2 + 154094^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (25212004049) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 802712 + ... + 833528.

Almost surely, 2^25212004040 is an apocalyptic number.

25212004040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25212004040 is an abundant number, since it is smaller than the sum of its proper divisors (32335063720).

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

25212004040 is a wasteful number, since it uses less digits than its factorization.

25212004040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31122 (or 31118 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

Adding to 25212004040 its reverse (4040021252), we get a palindrome (29252025292).

The spelling of 25212004040 in words is "twenty-five billion, two hundred twelve million, four thousand, forty".