2525735681 has 4 divisors (see below), whose sum is σ = 2886555072. Its totient is φ = 2164916292.

The previous prime is 2525735651. The next prime is 2525735689. The reversal of 2525735681 is 1865375252.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-2525735681 is a prime.

It is a super-2 number, since 2×2525735681² = 12758681460553067522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2525735689) 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, 180409685 + ... + 180409698.

It is an arithmetic number, because the mean of its divisors is an integer number (721638768).

Almost surely, 2^2525735681 is an apocalyptic number.

It is an amenable number.

2525735681 is a deficient number, since it is larger than the sum of its proper divisors (360819391).

2525735681 is an equidigital number, since it uses as much as digits as its factorization.

2525735681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360819390.

The product of its digits is 504000, while the sum is 44.

The square root of 2525735681 is about 50256.6978720250. The cubic root of 2525735681 is about 1361.8500774399.

The spelling of 2525735681 in words is "two billion, five hundred twenty-five million, seven hundred thirty-five thousand, six hundred eighty-one".