6665638365 has 32 divisors (see below), whose sum is σ = 11903216640. Its totient is φ = 3539049408.

The previous prime is 6665638363. The next prime is 6665638379. The reversal of 6665638365 is 5638365666.

It is not a de Polignac number, because 6665638365 - 2¹ = 6665638363 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665638363) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80602 + ... + 140811.

It is an arithmetic number, because the mean of its divisors is an integer number (371975520).

Almost surely, 2^6665638365 is an apocalyptic number.

It is an amenable number.

6665638365 is a deficient number, since it is larger than the sum of its proper divisors (5237578275).

6665638365 is a wasteful number, since it uses less digits than its factorization.

6665638365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221650 (or 221644 counting only the distinct ones).

The product of its digits is 13996800, while the sum is 54.

The square root of 6665638365 is about 81643.3608139694. The cubic root of 6665638365 is about 1881.9752858947.

The spelling of 6665638365 in words is "six billion, six hundred sixty-five million, six hundred thirty-eight thousand, three hundred sixty-five".