667020331 has 2 divisors, whose sum is σ = 667020332. Its totient is φ = 667020330.

The previous prime is 667020307. The next prime is 667020353. The reversal of 667020331 is 133020766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667020331 - 2⁷ = 667020203 is a prime.

It is a super-2 number, since 2×667020331² = 889832243934699122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 667020331.

It is not a weakly prime, because it can be changed into another prime (667020301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333510165 + 333510166.

It is an arithmetic number, because the mean of its divisors is an integer number (333510166).

Almost surely, 2^667020331 is an apocalyptic number.

667020331 is a deficient number, since it is larger than the sum of its proper divisors (1).

667020331 is an equidigital number, since it uses as much as digits as its factorization.

667020331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 28.

The square root of 667020331 is about 25826.7367470225. The cubic root of 667020331 is about 873.7349145542.

The spelling of 667020331 in words is "six hundred sixty-seven million, twenty thousand, three hundred thirty-one".