667051331 has 2 divisors, whose sum is σ = 667051332. Its totient is φ = 667051330.

The previous prime is 667051309. The next prime is 667051337. The reversal of 667051331 is 133150766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667051331 - 2²⁶ = 599942467 is a prime.

It is a super-2 number, since 2×667051331² = 889914956377743122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667051337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333525665 + 333525666.

It is an arithmetic number, because the mean of its divisors is an integer number (333525666).

Almost surely, 2^667051331 is an apocalyptic number.

667051331 is a deficient number, since it is larger than the sum of its proper divisors (1).

667051331 is an equidigital number, since it uses as much as digits as its factorization.

667051331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 667051331 is about 25827.3368932997. The cubic root of 667051331 is about 873.7484500550.

The spelling of 667051331 in words is "six hundred sixty-seven million, fifty-one thousand, three hundred thirty-one".