663071667 has 16 divisors (see below), whose sum is σ = 894466560. Its totient is φ = 436879872.

The previous prime is 663071659. The next prime is 663071681. The reversal of 663071667 is 766170366.

It is not a de Polignac number, because 663071667 - 2³ = 663071659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (663071467) 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 15 ways as a sum of consecutive naturals, for example, 176434 + ... + 180152.

It is an arithmetic number, because the mean of its divisors is an integer number (55904160).

Almost surely, 2^663071667 is an apocalyptic number.

663071667 is a deficient number, since it is larger than the sum of its proper divisors (231394893).

663071667 is a wasteful number, since it uses less digits than its factorization.

663071667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4402.

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 663071667 is about 25750.1779993848. The cubic root of 663071667 is about 872.0073729667.

The spelling of 663071667 in words is "six hundred sixty-three million, seventy-one thousand, six hundred sixty-seven".