2505681881 has 4 divisors (see below), whose sum is σ = 2533835700. Its totient is φ = 2477528064.

The previous prime is 2505681869. The next prime is 2505681883. The reversal of 2505681881 is 1881865052.

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 192071881 + 2313610000 = 13859^2 + 48100^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505681881 - 2⁶ = 2505681817 is a prime.

It is a super-2 number, since 2×2505681881² = 12556883377543396322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2505681883) 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, 14076776 + ... + 14076953.

It is an arithmetic number, because the mean of its divisors is an integer number (633458925).

Almost surely, 2^2505681881 is an apocalyptic number.

It is an amenable number.

2505681881 is a deficient number, since it is larger than the sum of its proper divisors (28153819).

2505681881 is an equidigital number, since it uses as much as digits as its factorization.

2505681881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28153818.

The product of its (nonzero) digits is 153600, while the sum is 44.

The square root of 2505681881 is about 50056.7865628628. The cubic root of 2505681881 is about 1358.2362301904.

The spelling of 2505681881 in words is "two billion, five hundred five million, six hundred eighty-one thousand, eight hundred eighty-one".