25123236420 has 24 divisors (see below), whose sum is σ = 70345062144. Its totient is φ = 6699529696.

The previous prime is 25123236407. The next prime is 25123236427. The reversal of 25123236420 is 2463232152.

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

It is not an unprimeable number, because it can be changed into a prime (25123236427) 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, 209360244 + ... + 209360363.

It is an arithmetic number, because the mean of its divisors is an integer number (2931044256).

Almost surely, 2^25123236420 is an apocalyptic number.

25123236420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25123236420 is an abundant number, since it is smaller than the sum of its proper divisors (45221825724).

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

25123236420 is a wasteful number, since it uses less digits than its factorization.

25123236420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418720619 (or 418720617 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 25123236420 its reverse (2463232152), we get a palindrome (27586468572).

The spelling of 25123236420 in words is "twenty-five billion, one hundred twenty-three million, two hundred thirty-six thousand, four hundred twenty".