667769731 has 2 divisors, whose sum is σ = 667769732. Its totient is φ = 667769730.

The previous prime is 667769723. The next prime is 667769743. The reversal of 667769731 is 137967766.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 667769731 - 2³ = 667769723 is a prime.

It is a super-2 number, since 2×667769731² = 891832827279624722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (667769701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333884865 + 333884866.

It is an arithmetic number, because the mean of its divisors is an integer number (333884866).

Almost surely, 2^667769731 is an apocalyptic number.

667769731 is a deficient number, since it is larger than the sum of its proper divisors (1).

667769731 is an equidigital number, since it uses as much as digits as its factorization.

667769731 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2000376, while the sum is 52.

The square root of 667769731 is about 25841.2408951273. The cubic root of 667769731 is about 874.0620069743.

The spelling of 667769731 in words is "six hundred sixty-seven million, seven hundred sixty-nine thousand, seven hundred thirty-one".