667214481517 has 2 divisors, whose sum is σ = 667214481518. Its totient is φ = 667214481516.

The previous prime is 667214481487. The next prime is 667214481523. The reversal of 667214481517 is 715184412766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 551542390281 + 115672091236 = 742659^2 + 340106^2 .

It is a cyclic number.

It is not a de Polignac number, because 667214481517 - 2¹⁵ = 667214448749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667214481547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333607240758 + 333607240759.

It is an arithmetic number, because the mean of its divisors is an integer number (333607240759).

Almost surely, 2^667214481517 is an apocalyptic number.

It is an amenable number.

667214481517 is a deficient number, since it is larger than the sum of its proper divisors (1).

667214481517 is an equidigital number, since it uses as much as digits as its factorization.

667214481517 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 52.

The spelling of 667214481517 in words is "six hundred sixty-seven billion, two hundred fourteen million, four hundred eighty-one thousand, five hundred seventeen".