25275818021 has 4 divisors (see below), whose sum is σ = 25281259500. Its totient is φ = 25270376544.

The previous prime is 25275818017. The next prime is 25275818111. The reversal of 25275818021 is 12081857252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23805095521 + 1470722500 = 154289^2 + 38350^2 .

It is a cyclic number.

It is not a de Polignac number, because 25275818021 - 2² = 25275818017 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25275818021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25275812021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2713766 + ... + 2723063.

It is an arithmetic number, because the mean of its divisors is an integer number (6320314875).

Almost surely, 2^25275818021 is an apocalyptic number.

It is an amenable number.

25275818021 is a deficient number, since it is larger than the sum of its proper divisors (5441479).

25275818021 is an equidigital number, since it uses as much as digits as its factorization.

25275818021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5441478.

The product of its (nonzero) digits is 89600, while the sum is 41.

The spelling of 25275818021 in words is "twenty-five billion, two hundred seventy-five million, eight hundred eighteen thousand, twenty-one".