25215320240 has 80 divisors (see below), whose sum is σ = 63993109536. Its totient is φ = 9163776000.

The previous prime is 25215320191. The next prime is 25215320303. The reversal of 25215320240 is 4202351252.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1665344 + ... + 1680416.

Almost surely, 2^25215320240 is an apocalyptic number.

25215320240 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 25215320240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31996554768).

25215320240 is an abundant number, since it is smaller than the sum of its proper divisors (38777789296).

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

25215320240 is a wasteful number, since it uses less digits than its factorization.

25215320240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16998 (or 16992 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

Adding to 25215320240 its reverse (4202351252), we get a palindrome (29417671492).

The spelling of 25215320240 in words is "twenty-five billion, two hundred fifteen million, three hundred twenty thousand, two hundred forty".