6665223557 has 8 divisors (see below), whose sum is σ = 6842172480. Its totient is φ = 6489272160.

The previous prime is 6665223529. The next prime is 6665223559. The reversal of 6665223557 is 7553225666.

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 6665223557 - 2⁶ = 6665223493 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 (6665223559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 235832 + ... + 262577.

It is an arithmetic number, because the mean of its divisors is an integer number (855271560).

Almost surely, 2^6665223557 is an apocalyptic number.

It is an amenable number.

6665223557 is a deficient number, since it is larger than the sum of its proper divisors (176948923).

6665223557 is a wasteful number, since it uses less digits than its factorization.

6665223557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498763.

The product of its digits is 2268000, while the sum is 47.

The square root of 6665223557 is about 81640.8204086657. The cubic root of 6665223557 is about 1881.9362461430.

It can be divided in two parts, 66652 and 23557, that added together give a palindrome (90209).

The spelling of 6665223557 in words is "six billion, six hundred sixty-five million, two hundred twenty-three thousand, five hundred fifty-seven".