666226031 has 2 divisors, whose sum is σ = 666226032. Its totient is φ = 666226030.

The previous prime is 666226021. The next prime is 666226087. The reversal of 666226031 is 130622666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 666226031 - 2¹⁸ = 665963887 is a prime.

It is a super-2 number, since 2×666226031² = 887714248764025922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (666226021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333113015 + 333113016.

It is an arithmetic number, because the mean of its divisors is an integer number (333113016).

Almost surely, 2^666226031 is an apocalyptic number.

666226031 is a deficient number, since it is larger than the sum of its proper divisors (1).

666226031 is an equidigital number, since it uses as much as digits as its factorization.

666226031 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 666226031 is about 25811.3546912982. The cubic root of 666226031 is about 873.3879569619.

Adding to 666226031 its reverse (130622666), we get a palindrome (796848697).

The spelling of 666226031 in words is "six hundred sixty-six million, two hundred twenty-six thousand, thirty-one".