6445565155 has 8 divisors (see below), whose sum is σ = 7850121552. Its totient is φ = 5079489888.

The previous prime is 6445565123. The next prime is 6445565179. The reversal of 6445565155 is 5515655446.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6445565155 - 2⁵ = 6445565123 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9619912 + ... + 9620581.

It is an arithmetic number, because the mean of its divisors is an integer number (981265194).

Almost surely, 2^6445565155 is an apocalyptic number.

6445565155 is a deficient number, since it is larger than the sum of its proper divisors (1404556397).

6445565155 is a wasteful number, since it uses less digits than its factorization.

6445565155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19240565.

The product of its digits is 1800000, while the sum is 46.

The square root of 6445565155 is about 80284.2771344427. The cubic root of 6445565155 is about 1861.0312579116.

The spelling of 6445565155 in words is "six billion, four hundred forty-five million, five hundred sixty-five thousand, one hundred fifty-five".