25870072821 has 8 divisors (see below), whose sum is σ = 34523403264. Its totient is φ = 17231728800.

The previous prime is 25870072819. The next prime is 25870072829. The reversal of 25870072821 is 12827007852.

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

It is not a de Polignac number, because 25870072821 - 2¹ = 25870072819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25870072829) 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 7 ways as a sum of consecutive naturals, for example, 3742576 + ... + 3749481.

It is an arithmetic number, because the mean of its divisors is an integer number (4315425408).

Almost surely, 2^25870072821 is an apocalyptic number.

It is an amenable number.

25870072821 is a deficient number, since it is larger than the sum of its proper divisors (8653330443).

25870072821 is a wasteful number, since it uses less digits than its factorization.

25870072821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7493211.

The product of its (nonzero) digits is 125440, while the sum is 42.

The spelling of 25870072821 in words is "twenty-five billion, eight hundred seventy million, seventy-two thousand, eight hundred twenty-one".