6445511755 has 16 divisors (see below), whose sum is σ = 7793288064. Its totient is φ = 5117374080.

The previous prime is 6445511753. The next prime is 6445511773. The reversal of 6445511755 is 5571155446.

It is a happy number.

It is not a de Polignac number, because 6445511755 - 2¹ = 6445511753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6445511753) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 710629 + ... + 719641.

It is an arithmetic number, because the mean of its divisors is an integer number (487080504).

Almost surely, 2^6445511755 is an apocalyptic number.

6445511755 is a deficient number, since it is larger than the sum of its proper divisors (1347776309).

6445511755 is a wasteful number, since it uses less digits than its factorization.

6445511755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10086.

The product of its digits is 420000, while the sum is 43.

The square root of 6445511755 is about 80283.9445655232. The cubic root of 6445511755 is about 1861.0261184945.

The spelling of 6445511755 in words is "six billion, four hundred forty-five million, five hundred eleven thousand, seven hundred fifty-five".