25478216892 has 18 divisors (see below), whose sum is σ = 64403270568. Its totient is φ = 8492738952.

The previous prime is 25478216867. The next prime is 25478216893. The reversal of 25478216892 is 29861287452.

25478216892 is a `hidden beast` number, since 2 + 5 + 478 + 2 + 168 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25478216893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 353864088 + ... + 353864159.

It is an arithmetic number, because the mean of its divisors is an integer number (3577959476).

Almost surely, 2^25478216892 is an apocalyptic number.

It is an amenable number.

25478216892 is an abundant number, since it is smaller than the sum of its proper divisors (38925053676).

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

25478216892 is a wasteful number, since it uses less digits than its factorization.

25478216892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707728257 (or 707728252 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 54.

The spelling of 25478216892 in words is "twenty-five billion, four hundred seventy-eight million, two hundred sixteen thousand, eight hundred ninety-two".