667732049 has 2 divisors, whose sum is σ = 667732050. Its totient is φ = 667732048.

The previous prime is 667732019. The next prime is 667732063. The reversal of 667732049 is 940237766.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 609102400 + 58629649 = 24680^2 + 7657^2 .

It is a cyclic number.

It is not a de Polignac number, because 667732049 - 2⁸ = 667731793 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (667732019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333866024 + 333866025.

It is an arithmetic number, because the mean of its divisors is an integer number (333866025).

Almost surely, 2^667732049 is an apocalyptic number.

It is an amenable number.

667732049 is a deficient number, since it is larger than the sum of its proper divisors (1).

667732049 is an equidigital number, since it uses as much as digits as its factorization.

667732049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 667732049 is about 25840.5117789877. The cubic root of 667732049 is about 874.0455656660.

The spelling of 667732049 in words is "six hundred sixty-seven million, seven hundred thirty-two thousand, forty-nine".