667767121 has 8 divisors (see below), whose sum is σ = 772357824. Its totient is φ = 565475280.

The previous prime is 667767097. The next prime is 667767131. The reversal of 667767121 is 121767766.

667767121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 667767121 - 2⁷ = 667766993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667767131) 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, 574090 + ... + 575251.

It is an arithmetic number, because the mean of its divisors is an integer number (96544728).

Almost surely, 2^667767121 is an apocalyptic number.

It is an amenable number.

667767121 is a deficient number, since it is larger than the sum of its proper divisors (104590703).

667767121 is a wasteful number, since it uses less digits than its factorization.

667767121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149431.

The product of its digits is 148176, while the sum is 43.

The square root of 667767121 is about 25841.1903944071. The cubic root of 667767121 is about 874.0608682061.

The spelling of 667767121 in words is "six hundred sixty-seven million, seven hundred sixty-seven thousand, one hundred twenty-one".