66673393751 has 2 divisors, whose sum is σ = 66673393752. Its totient is φ = 66673393750.

The previous prime is 66673393651. The next prime is 66673393777. The reversal of 66673393751 is 15739337666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66673393751 - 2¹⁴ = 66673377367 is a prime.

It is a super-3 number, since 3×66673393751³ (a number of 33 digits) contains 333 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 (66673393781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33336696875 + 33336696876.

It is an arithmetic number, because the mean of its divisors is an integer number (33336696876).

Almost surely, 2^66673393751 is an apocalyptic number.

66673393751 is a deficient number, since it is larger than the sum of its proper divisors (1).

66673393751 is an equidigital number, since it uses as much as digits as its factorization.

66673393751 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12859560, while the sum is 56.

The spelling of 66673393751 in words is "sixty-six billion, six hundred seventy-three million, three hundred ninety-three thousand, seven hundred fifty-one".