66873554819 has 2 divisors, whose sum is σ = 66873554820. Its totient is φ = 66873554818.

The previous prime is 66873554791. The next prime is 66873554831. The reversal of 66873554819 is 91845537866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66873554819 - 2²⁰ = 66872506243 is a prime.

It is a super-2 number, since 2×66873554819² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66873554219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33436777409 + 33436777410.

It is an arithmetic number, because the mean of its divisors is an integer number (33436777410).

Almost surely, 2^66873554819 is an apocalyptic number.

66873554819 is a deficient number, since it is larger than the sum of its proper divisors (1).

66873554819 is an equidigital number, since it uses as much as digits as its factorization.

66873554819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43545600, while the sum is 62.

The spelling of 66873554819 in words is "sixty-six billion, eight hundred seventy-three million, five hundred fifty-four thousand, eight hundred nineteen".