25122404640 has 48 divisors (see below), whose sum is σ = 79135576128. Its totient is φ = 6699307776.

The previous prime is 25122404627. The next prime is 25122404641. The reversal of 25122404640 is 4640422152.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×25122404640² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25122404598 and 25122404607.

It is not an unprimeable number, because it can be changed into a prime (25122404641) 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 7 ways as a sum of consecutive naturals, for example, 26168692 + ... + 26169651.

It is an arithmetic number, because the mean of its divisors is an integer number (1648657836).

Almost surely, 2^25122404640 is an apocalyptic number.

25122404640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25122404640 is an abundant number, since it is smaller than the sum of its proper divisors (54013171488).

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

25122404640 is a wasteful number, since it uses less digits than its factorization.

25122404640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52338361 (or 52338353 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

Adding to 25122404640 its reverse (4640422152), we get a palindrome (29762826792).

The spelling of 25122404640 in words is "twenty-five billion, one hundred twenty-two million, four hundred four thousand, six hundred forty".