25218645018 has 128 divisors (see below), whose sum is σ = 60436316160. Its totient is φ = 6864168960.

The previous prime is 25218644981. The next prime is 25218645041. The reversal of 25218645018 is 81054681252.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 42526930 + ... + 42527522.

It is an arithmetic number, because the mean of its divisors is an integer number (472158720).

Almost surely, 2^25218645018 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25218645018, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30218158080).

25218645018 is an abundant number, since it is smaller than the sum of its proper divisors (35217671142).

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

25218645018 is a wasteful number, since it uses less digits than its factorization.

25218645018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 153600, while the sum is 42.

The spelling of 25218645018 in words is "twenty-five billion, two hundred eighteen million, six hundred forty-five thousand, eighteen".