2525743681 has 4 divisors (see below), whose sum is σ = 2557715200. Its totient is φ = 2493772164.

The previous prime is 2525743657. The next prime is 2525743711. The reversal of 2525743681 is 1863475252.

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 cyclic number.

It is not a de Polignac number, because 2525743681 - 2⁷ = 2525743553 is a prime.

It is a super-2 number, since 2×2525743681² = 12758762284222859522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2525743651) 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, 15985641 + ... + 15985798.

It is an arithmetic number, because the mean of its divisors is an integer number (639428800).

Almost surely, 2^2525743681 is an apocalyptic number.

It is an amenable number.

2525743681 is a deficient number, since it is larger than the sum of its proper divisors (31971519).

2525743681 is an equidigital number, since it uses as much as digits as its factorization.

2525743681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31971518.

The product of its digits is 403200, while the sum is 43.

The square root of 2525743681 is about 50256.7774633432. Note that the first 3 decimals coincide. The cubic root of 2525743681 is about 1361.8515152770.

The spelling of 2525743681 in words is "two billion, five hundred twenty-five million, seven hundred forty-three thousand, six hundred eighty-one".