2625055781 has 4 divisors (see below), whose sum is σ = 2625307872. Its totient is φ = 2624803692.

The previous prime is 2625055733. The next prime is 2625055841. The reversal of 2625055781 is 1875505262.

2625055781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1875505262 = 2 ⋅937752631.

It is a cyclic number.

It is not a de Polignac number, because 2625055781 - 2²⁶ = 2557946917 is a prime.

It is a super-2 number, since 2×2625055781² = 13781835706723039922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2625055681) 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, 109721 + ... + 131486.

It is an arithmetic number, because the mean of its divisors is an integer number (656326968).

Almost surely, 2^2625055781 is an apocalyptic number.

It is an amenable number.

2625055781 is a deficient number, since it is larger than the sum of its proper divisors (252091).

2625055781 is a wasteful number, since it uses less digits than its factorization.

2625055781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252090.

The product of its (nonzero) digits is 168000, while the sum is 41.

The square root of 2625055781 is about 51235.2981937258. The cubic root of 2625055781 is about 1379.4718592673.

The spelling of 2625055781 in words is "two billion, six hundred twenty-five million, fifty-five thousand, seven hundred eighty-one".