66450004554191 has 2 divisors, whose sum is σ = 66450004554192. Its totient is φ = 66450004554190.

The previous prime is 66450004554121. The next prime is 66450004554209. The reversal of 66450004554191 is 19145540005466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66450004554191 - 2⁴² = 62051958043087 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66450004554121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33225002277095 + 33225002277096.

It is an arithmetic number, because the mean of its divisors is an integer number (33225002277096).

Almost surely, 2^{66450004554191} is an apocalyptic number.

66450004554191 is a deficient number, since it is larger than the sum of its proper divisors (1).

66450004554191 is an equidigital number, since it uses as much as digits as its factorization.

66450004554191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592000, while the sum is 50.

The spelling of 66450004554191 in words is "sixty-six trillion, four hundred fifty billion, four million, five hundred fifty-four thousand, one hundred ninety-one".