2002161025 has 6 divisors (see below), whose sum is σ = 2482679702. Its totient is φ = 1601728800.

The previous prime is 2002161023. The next prime is 2002161041. The reversal of 2002161025 is 5201612002.

It can be written as a sum of positive squares in 3 ways, for example, as 399680064 + 1602480961 = 19992^2 + 40031^2 .

It is not a de Polignac number, because 2002161025 - 2¹ = 2002161023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2002160993 and 2002161011.

It is not an unprimeable number, because it can be changed into a prime (2002161023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 40043196 + ... + 40043245.

Almost surely, 2^2002161025 is an apocalyptic number.

2002161025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2002161025 is a deficient number, since it is larger than the sum of its proper divisors (480518677).

2002161025 is an equidigital number, since it uses as much as digits as its factorization.

2002161025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80086451 (or 80086446 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 2002161025 is about 44745.5140209608. The cubic root of 2002161025 is about 1260.3746733666.

Adding to 2002161025 its reverse (5201612002), we get a palindrome (7203773027).

The spelling of 2002161025 in words is "two billion, two million, one hundred sixty-one thousand, twenty-five".