66404667 has 16 divisors (see below), whose sum is σ = 102615552. Its totient is φ = 37410240.

The previous prime is 66404659. The next prime is 66404687. The reversal of 66404667 is 76640466.

It is not a de Polignac number, because 66404667 - 2³ = 66404659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66404627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20778 + ... + 23759.

It is an arithmetic number, because the mean of its divisors is an integer number (6413472).

Almost surely, 2^66404667 is an apocalyptic number.

66404667 is a deficient number, since it is larger than the sum of its proper divisors (36210885).

66404667 is a wasteful number, since it uses less digits than its factorization.

66404667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44618.

The product of its (nonzero) digits is 145152, while the sum is 39.

The square root of 66404667 is about 8148.9058774783. The cubic root of 66404667 is about 404.9482573738.

The spelling of 66404667 in words is "sixty-six million, four hundred four thousand, six hundred sixty-seven".