6643145527 has 4 divisors (see below), whose sum is σ = 6857440576. Its totient is φ = 6428850480.

The previous prime is 6643145521. The next prime is 6643145563. The reversal of 6643145527 is 7255413466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6643145527 - 2¹⁹ = 6642621239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6643145521) 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, 107147478 + ... + 107147539.

It is an arithmetic number, because the mean of its divisors is an integer number (1714360144).

Almost surely, 2^6643145527 is an apocalyptic number.

6643145527 is a deficient number, since it is larger than the sum of its proper divisors (214295049).

6643145527 is a wasteful number, since it uses less digits than its factorization.

6643145527 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214295048.

The product of its digits is 604800, while the sum is 43.

The square root of 6643145527 is about 81505.4938455071. The cubic root of 6643145527 is about 1879.8560255483.

The spelling of 6643145527 in words is "six billion, six hundred forty-three million, one hundred forty-five thousand, five hundred twenty-seven".