66754760819 has 2 divisors, whose sum is σ = 66754760820. Its totient is φ = 66754760818.

The previous prime is 66754760789. The next prime is 66754760843. The reversal of 66754760819 is 91806745766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66754760819 - 2¹² = 66754756723 is a prime.

It is a super-2 number, since 2×66754760819² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66754760879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33377380409 + 33377380410.

It is an arithmetic number, because the mean of its divisors is an integer number (33377380410).

Almost surely, 2^66754760819 is an apocalyptic number.

66754760819 is a deficient number, since it is larger than the sum of its proper divisors (1).

66754760819 is an equidigital number, since it uses as much as digits as its factorization.

66754760819 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15240960, while the sum is 59.

The spelling of 66754760819 in words is "sixty-six billion, seven hundred fifty-four million, seven hundred sixty thousand, eight hundred nineteen".