25420042340 has 96 divisors (see below), whose sum is σ = 66963262464. Its totient is φ = 7874444160.

The previous prime is 25420042337. The next prime is 25420042343. The reversal of 25420042340 is 4324002452.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (25420042337) and next prime (25420042343).

It is not an unprimeable number, because it can be changed into a prime (25420042343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 200387 + ... + 301653.

It is an arithmetic number, because the mean of its divisors is an integer number (697533984).

Almost surely, 2^25420042340 is an apocalyptic number.

25420042340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25420042340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33481631232).

25420042340 is an abundant number, since it is smaller than the sum of its proper divisors (41543220124).

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

25420042340 is a wasteful number, since it uses less digits than its factorization.

25420042340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101457 (or 101455 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 26.

Adding to 25420042340 its reverse (4324002452), we get a palindrome (29744044792).

The spelling of 25420042340 in words is "twenty-five billion, four hundred twenty million, forty-two thousand, three hundred forty".