667039771 has 2 divisors, whose sum is σ = 667039772. Its totient is φ = 667039770.

The previous prime is 667039757. The next prime is 667039787. The reversal of 667039771 is 177930766.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667039771 - 2⁹ = 667039259 is a prime.

It is not a weakly prime, because it can be changed into another prime (667039171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333519885 + 333519886.

It is an arithmetic number, because the mean of its divisors is an integer number (333519886).

Almost surely, 2^667039771 is an apocalyptic number.

667039771 is a deficient number, since it is larger than the sum of its proper divisors (1).

667039771 is an equidigital number, since it uses as much as digits as its factorization.

667039771 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 333396, while the sum is 46.

The square root of 667039771 is about 25827.1130984475. The cubic root of 667039771 is about 873.7434026721.

The spelling of 667039771 in words is "six hundred sixty-seven million, thirty-nine thousand, seven hundred seventy-one".