66205019 has 2 divisors, whose sum is σ = 66205020. Its totient is φ = 66205018.

The previous prime is 66204989. The next prime is 66205031. The reversal of 66205019 is 91050266.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66205019 - 2⁸ = 66204763 is a prime.

It is a super-2 number, since 2×66205019² = 8766209081580722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66204982 and 66205000.

It is not a weakly prime, because it can be changed into another prime (66205049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33102509 + 33102510.

It is an arithmetic number, because the mean of its divisors is an integer number (33102510).

Almost surely, 2^66205019 is an apocalyptic number.

66205019 is a deficient number, since it is larger than the sum of its proper divisors (1).

66205019 is an equidigital number, since it uses as much as digits as its factorization.

66205019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 66205019 is about 8136.6466680077. The cubic root of 66205019 is about 404.5420195184.

The spelling of 66205019 in words is "sixty-six million, two hundred five thousand, nineteen".