25563837240 has 192 divisors, whose sum is σ = 85453898400. Its totient is φ = 6622995456.

The previous prime is 25563837197. The next prime is 25563837251. The reversal of 25563837240 is 4273836552.

25563837240 is a `hidden beast` number, since 2 + 5 + 5 + 638 + 3 + 7 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14957506 + ... + 14959214.

Almost surely, 2^25563837240 is an apocalyptic number.

25563837240 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 25563837240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42726949200).

25563837240 is an abundant number, since it is smaller than the sum of its proper divisors (59890061160).

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

25563837240 is a wasteful number, since it uses less digits than its factorization.

25563837240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2886 (or 2879 counting only the distinct ones).

The product of its (nonzero) digits is 1209600, while the sum is 45.

The spelling of 25563837240 in words is "twenty-five billion, five hundred sixty-three million, eight hundred thirty-seven thousand, two hundred forty".