25454343840 has 192 divisors, whose sum is σ = 81150854400. Its totient is φ = 6706151424.

The previous prime is 25454343779. The next prime is 25454343841. The reversal of 25454343840 is 4834345452.

It is a junction number, because it is equal to n+sod(n) for n = 25454343792 and 25454343801.

It is not an unprimeable number, because it can be changed into a prime (25454343841) 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, 23810826 + ... + 23811894.

It is an arithmetic number, because the mean of its divisors is an integer number (422660700).

Almost surely, 2^25454343840 is an apocalyptic number.

25454343840 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 25454343840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40575427200).

25454343840 is an abundant number, since it is smaller than the sum of its proper divisors (55696510560).

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

25454343840 is a wasteful number, since it uses less digits than its factorization.

25454343840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1639 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 42.

The spelling of 25454343840 in words is "twenty-five billion, four hundred fifty-four million, three hundred forty-three thousand, eight hundred forty".