66879019 has 2 divisors, whose sum is σ = 66879020. Its totient is φ = 66879018.

The previous prime is 66879013. The next prime is 66879047. The reversal of 66879019 is 91097866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66879019 - 2³ = 66879011 is a prime.

It is a super-2 number, since 2×66879019² = 8945606364804722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 66879019.

It is not a weakly prime, because it can be changed into another prime (66879011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33439509 + 33439510.

It is an arithmetic number, because the mean of its divisors is an integer number (33439510).

Almost surely, 2^66879019 is an apocalyptic number.

66879019 is a deficient number, since it is larger than the sum of its proper divisors (1).

66879019 is an equidigital number, since it uses as much as digits as its factorization.

66879019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 46.

The square root of 66879019 is about 8177.9593420364. The cubic root of 66879019 is about 405.9101999942.

The spelling of 66879019 in words is "sixty-six million, eight hundred seventy-nine thousand, nineteen".