6666431505 has 8 divisors (see below), whose sum is σ = 10666290432. Its totient is φ = 3555430128.

The previous prime is 6666431461. The next prime is 6666431507. The reversal of 6666431505 is 5051346666.

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

It is not a de Polignac number, because 6666431505 - 2⁸ = 6666431249 is a prime.

It is a super-3 number, since 3×6666431505³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6666431507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222214369 + ... + 222214398.

It is an arithmetic number, because the mean of its divisors is an integer number (1333286304).

Almost surely, 2^6666431505 is an apocalyptic number.

It is an amenable number.

6666431505 is a deficient number, since it is larger than the sum of its proper divisors (3999858927).

6666431505 is a wasteful number, since it uses less digits than its factorization.

6666431505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444428775.

The product of its (nonzero) digits is 388800, while the sum is 42.

The square root of 6666431505 is about 81648.2180148471. The cubic root of 6666431505 is about 1882.0499279418.

The spelling of 6666431505 in words is "six billion, six hundred sixty-six million, four hundred thirty-one thousand, five hundred five".