2625640081 has 3 divisors (see below), whose sum is σ = 2625691323. Its totient is φ = 2625588840.

The previous prime is 2625640067. The next prime is 2625640103. The reversal of 2625640081 is 1800465262.

The square root of 2625640081 is 51241.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1076430481 + 1549209600 = 32809^2 + 39360^2 .

It is not a de Polignac number, because 2625640081 - 2¹³ = 2625631889 is a prime.

It is a super-2 number, since 2×2625640081² = 13787971669907373122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2625640051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 25621 + ... + 76861.

It is an arithmetic number, because the mean of its divisors is an integer number (875230441).

Almost surely, 2^2625640081 is an apocalyptic number.

2625640081 is the 51241-st square number.

2625640081 is the 25621-st centered octagonal number.

It is an amenable number.

2625640081 is a deficient number, since it is larger than the sum of its proper divisors (51242).

2625640081 is an frugal number, since it uses more digits than its factorization.

2625640081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102482 (or 51241 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The cubic root of 2625640081 is about 1379.5742019321.

The spelling of 2625640081 in words is "two billion, six hundred twenty-five million, six hundred forty thousand, eighty-one".