2625355681 has 10 divisors (see below), whose sum is σ = 2844158602. Its totient is φ = 2423378880.

The previous prime is 2625355613. The next prime is 2625355699. The reversal of 2625355681 is 1865535262.

It can be written as a sum of positive squares in 5 ways, for example, as 2502500625 + 122855056 = 50025^2 + 11084^2 .

It is not a de Polignac number, because 2625355681 - 2²¹ = 2623258529 is a prime.

It is a super-2 number, since 2×2625355681² = 13784984903517947522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2625356681) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 17400 + ... + 74521.

Almost surely, 2^2625355681 is an apocalyptic number.

It is an amenable number.

2625355681 is a deficient number, since it is larger than the sum of its proper divisors (218802921).

2625355681 is an frugal number, since it uses more digits than its factorization.

2625355681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91973 (or 91934 counting only the distinct ones).

The product of its digits is 432000, while the sum is 43.

The square root of 2625355681 is about 51238.2248033634. The cubic root of 2625355681 is about 1379.5243899424.

The spelling of 2625355681 in words is "two billion, six hundred twenty-five million, three hundred fifty-five thousand, six hundred eighty-one".