4057645581 has 18 divisors (see below), whose sum is σ = 6442305870. Its totient is φ = 2459178480.

The previous prime is 4057645513. The next prime is 4057645591. The reversal of 4057645581 is 1855467504.

4057645581 is a `hidden beast` number, since 4 + 0 + 5 + 7 + 64 + 5 + 581 = 666.

4057645581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 2684276100 + 1373369481 = 51810^2 + 37059^2 .

It is not a de Polignac number, because 4057645581 - 2⁹ = 4057645069 is a prime.

It is a super-2 number, since 2×4057645581² = 32928975322017655122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4057645591) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1861926 + ... + 1864103.

Almost surely, 2^4057645581 is an apocalyptic number.

It is an amenable number.

4057645581 is a deficient number, since it is larger than the sum of its proper divisors (2384660289).

4057645581 is a wasteful number, since it uses less digits than its factorization.

4057645581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3726057 (or 3726043 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The square root of 4057645581 is about 63699.6513412750. The cubic root of 4057645581 is about 1594.9902654975.

It can be divided in two parts, 40576455 and 81, that added together give a triangular number (40576536 = T₉₀₀₈).

The spelling of 4057645581 in words is "four billion, fifty-seven million, six hundred forty-five thousand, five hundred eighty-one".