4145055521 has 4 divisors (see below), whose sum is σ = 4287988500. Its totient is φ = 4002122544.

The previous prime is 4145055511. The next prime is 4145055529. The reversal of 4145055521 is 1255505414.

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 1628929600 + 2516125921 = 40360^2 + 50161^2 .

It is a cyclic number.

It is not a de Polignac number, because 4145055521 - 2⁶ = 4145055457 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4145055529) 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, 71466446 + ... + 71466503.

It is an arithmetic number, because the mean of its divisors is an integer number (1071997125).

Almost surely, 2^4145055521 is an apocalyptic number.

It is an amenable number.

4145055521 is a deficient number, since it is larger than the sum of its proper divisors (142932979).

4145055521 is a wasteful number, since it uses less digits than its factorization.

4145055521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142932978.

The product of its (nonzero) digits is 20000, while the sum is 32.

The square root of 4145055521 is about 64382.1055961981. The cubic root of 4145055521 is about 1606.3621063513.

The spelling of 4145055521 in words is "four billion, one hundred forty-five million, fifty-five thousand, five hundred twenty-one".