666951763519 has 2 divisors, whose sum is σ = 666951763520. Its totient is φ = 666951763518.

The previous prime is 666951763501. The next prime is 666951763523. The reversal of 666951763519 is 915367159666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 666951763519 - 2⁹ = 666951763007 is a prime.

It is a super-2 number, since 2×666951763519² (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 (666951773519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333475881759 + 333475881760.

It is an arithmetic number, because the mean of its divisors is an integer number (333475881760).

Almost surely, 2^666951763519 is an apocalyptic number.

666951763519 is a deficient number, since it is larger than the sum of its proper divisors (1).

666951763519 is an equidigital number, since it uses as much as digits as its factorization.

666951763519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55112400, while the sum is 64.

The spelling of 666951763519 in words is "six hundred sixty-six billion, nine hundred fifty-one million, seven hundred sixty-three thousand, five hundred nineteen".