6665505051 has 4 divisors (see below), whose sum is σ = 8887340072. Its totient is φ = 4443670032.

The previous prime is 6665505043. The next prime is 6665505053. The reversal of 6665505051 is 1505055666.

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

It is not a de Polignac number, because 6665505051 - 2³ = 6665505043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6665505053) 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, 1110917506 + ... + 1110917511.

It is an arithmetic number, because the mean of its divisors is an integer number (2221835018).

Almost surely, 2^6665505051 is an apocalyptic number.

6665505051 is a deficient number, since it is larger than the sum of its proper divisors (2221835021).

6665505051 is a wasteful number, since it uses less digits than its factorization.

6665505051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2221835020.

The product of its (nonzero) digits is 135000, while the sum is 39.

The square root of 6665505051 is about 81642.5443687297. The cubic root of 6665505051 is about 1881.9627391931.

The spelling of 6665505051 in words is "six billion, six hundred sixty-five million, five hundred five thousand, fifty-one".