25668215424 has 96 divisors (see below), whose sum is σ = 75859385940. Its totient is φ = 8324812800.

The previous prime is 25668215423. The next prime is 25668215467. The reversal of 25668215424 is 42451286652.

25668215424 is a `hidden beast` number, since 2 + 5 + 6 + 6 + 8 + 215 + 424 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17152617024 + 8515598400 = 130968^2 + 92280^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is a self number, because there is not a number n which added to its sum of digits gives 25668215424.

It is not an unprimeable number, because it can be changed into a prime (25668215423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 258477 + ... + 343724.

Almost surely, 2^25668215424 is an apocalyptic number.

25668215424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

25668215424 is an abundant number, since it is smaller than the sum of its proper divisors (50191170516).

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

25668215424 is a wasteful number, since it uses less digits than its factorization.

25668215424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602258 (or 602243 counting only the distinct ones).

The product of its digits is 921600, while the sum is 45.

The spelling of 25668215424 in words is "twenty-five billion, six hundred sixty-eight million, two hundred fifteen thousand, four hundred twenty-four".