66433661423 has 2 divisors, whose sum is σ = 66433661424. Its totient is φ = 66433661422.

The previous prime is 66433661401. The next prime is 66433661471. The reversal of 66433661423 is 32416633466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66433661423 - 2⁸ = 66433661167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66433663423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33216830711 + 33216830712.

It is an arithmetic number, because the mean of its divisors is an integer number (33216830712).

Almost surely, 2^66433661423 is an apocalyptic number.

66433661423 is a deficient number, since it is larger than the sum of its proper divisors (1).

66433661423 is an equidigital number, since it uses as much as digits as its factorization.

66433661423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1119744, while the sum is 44.

The spelling of 66433661423 in words is "sixty-six billion, four hundred thirty-three million, six hundred sixty-one thousand, four hundred twenty-three".