666731401229 has 2 divisors, whose sum is σ = 666731401230. Its totient is φ = 666731401228.

The previous prime is 666731401177. The next prime is 666731401249. The reversal of 666731401229 is 922104137666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 517176722500 + 149554678729 = 719150^2 + 386723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-666731401229 is a prime.

It is a super-2 number, since 2×666731401229² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666731401249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333365700614 + 333365700615.

It is an arithmetic number, because the mean of its divisors is an integer number (333365700615).

Almost surely, 2^666731401229 is an apocalyptic number.

It is an amenable number.

666731401229 is a deficient number, since it is larger than the sum of its proper divisors (1).

666731401229 is an equidigital number, since it uses as much as digits as its factorization.

666731401229 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 666731401229 in words is "six hundred sixty-six billion, seven hundred thirty-one million, four hundred one thousand, two hundred twenty-nine".