667046255721 has 4 divisors (see below), whose sum is σ = 889395007632. Its totient is φ = 444697503812.

The previous prime is 667046255669. The next prime is 667046255723. The reversal of 667046255721 is 127552640766.

667046255721 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 667046255721 - 2⁷ = 667046255593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667046255723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111174375951 + ... + 111174375956.

It is an arithmetic number, because the mean of its divisors is an integer number (222348751908).

Almost surely, 2^667046255721 is an apocalyptic number.

It is an amenable number.

667046255721 is a deficient number, since it is larger than the sum of its proper divisors (222348751911).

667046255721 is a wasteful number, since it uses less digits than its factorization.

667046255721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222348751910.

The product of its (nonzero) digits is 4233600, while the sum is 51.

The spelling of 667046255721 in words is "six hundred sixty-seven billion, forty-six million, two hundred fifty-five thousand, seven hundred twenty-one".