8021553125 has 12 divisors (see below), whose sum is σ = 10026303588. Its totient is φ = 6417240000.

The previous prime is 8021553119. The next prime is 8021553203. The reversal of 8021553125 is 5213551208.

It can be written as a sum of positive squares in 6 ways, for example, as 6635405764 + 1386147361 = 81458^2 + 37231^2 .

It is not a de Polignac number, because 8021553125 - 2⁴ = 8021553109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 8021553091 and 8021553100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1280324 + ... + 1286573.

It is an arithmetic number, because the mean of its divisors is an integer number (835525299).

Almost surely, 2^8021553125 is an apocalyptic number.

It is an amenable number.

8021553125 is a deficient number, since it is larger than the sum of its proper divisors (2004750463).

8021553125 is an frugal number, since it uses more digits than its factorization.

8021553125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2566922 (or 2566902 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 32.

The square root of 8021553125 is about 89563.1236893846. The cubic root of 8021553125 is about 2001.7944831835.

The spelling of 8021553125 in words is "eight billion, twenty-one million, five hundred fifty-three thousand, one hundred twenty-five".