25382778821 has 8 divisors (see below), whose sum is σ = 25608680064. Its totient is φ = 25157858320.

The previous prime is 25382778809. The next prime is 25382778853. The reversal of 25382778821 is 12887728352.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25382778821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25382778871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193145 + ... + 296766.

It is an arithmetic number, because the mean of its divisors is an integer number (3201085008).

Almost surely, 2^25382778821 is an apocalyptic number.

It is an amenable number.

25382778821 is a deficient number, since it is larger than the sum of its proper divisors (225901243).

25382778821 is a wasteful number, since it uses less digits than its factorization.

25382778821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490371.

The product of its digits is 3010560, while the sum is 53.

The spelling of 25382778821 in words is "twenty-five billion, three hundred eighty-two million, seven hundred seventy-eight thousand, eight hundred twenty-one".