667365731 has 2 divisors, whose sum is σ = 667365732. Its totient is φ = 667365730.

The previous prime is 667365691. The next prime is 667365757. The reversal of 667365731 is 137563766.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667365731 is a prime.

It is a super-2 number, since 2×667365731² = 890754037826328722, which contains 22 as substring.

It is equal to p_34648865 and since 667365731 and 34648865 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (667365331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333682865 + 333682866.

It is an arithmetic number, because the mean of its divisors is an integer number (333682866).

Almost surely, 2^667365731 is an apocalyptic number.

667365731 is a deficient number, since it is larger than the sum of its proper divisors (1).

667365731 is an equidigital number, since it uses as much as digits as its factorization.

667365731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 44.

The square root of 667365731 is about 25833.4227503829. The cubic root of 667365731 is about 873.8857025433.

The spelling of 667365731 in words is "six hundred sixty-seven million, three hundred sixty-five thousand, seven hundred thirty-one".