667705220431 has 2 divisors, whose sum is σ = 667705220432. Its totient is φ = 667705220430.

The previous prime is 667705220311. The next prime is 667705220447. The reversal of 667705220431 is 134022507766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667705220431 - 2²¹ = 667703123279 is a prime.

It is a super-2 number, since 2×667705220431² (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 (667705220131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333852610215 + 333852610216.

It is an arithmetic number, because the mean of its divisors is an integer number (333852610216).

Almost surely, 2^667705220431 is an apocalyptic number.

667705220431 is a deficient number, since it is larger than the sum of its proper divisors (1).

667705220431 is an equidigital number, since it uses as much as digits as its factorization.

667705220431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 423360, while the sum is 43.

The spelling of 667705220431 in words is "six hundred sixty-seven billion, seven hundred five million, two hundred twenty thousand, four hundred thirty-one".