667020228821 has 4 divisors (see below), whose sum is σ = 667028407392. Its totient is φ = 667012050252.

The previous prime is 667020228761. The next prime is 667020228877. The reversal of 667020228821 is 128822020766.

667020228821 is digitally balanced in base 2, because in such base 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 667020228821 - 2¹⁴ = 667020212437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667020221821) 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, 3965705 + ... + 4130478.

It is an arithmetic number, because the mean of its divisors is an integer number (166757101848).

Almost surely, 2^667020228821 is an apocalyptic number.

It is an amenable number.

667020228821 is a deficient number, since it is larger than the sum of its proper divisors (8178571).

667020228821 is an equidigital number, since it uses as much as digits as its factorization.

667020228821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8178570.

The product of its (nonzero) digits is 258048, while the sum is 44.

The spelling of 667020228821 in words is "six hundred sixty-seven billion, twenty million, two hundred twenty-eight thousand, eight hundred twenty-one".