66563604479 has 2 divisors, whose sum is σ = 66563604480. Its totient is φ = 66563604478.

The previous prime is 66563604473. The next prime is 66563604517. The reversal of 66563604479 is 97440636566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66563604479 - 2²⁸ = 66295169023 is a prime.

It is a super-2 number, since 2×66563604479² (a number of 22 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66563604473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33281802239 + 33281802240.

It is an arithmetic number, because the mean of its divisors is an integer number (33281802240).

Almost surely, 2^66563604479 is an apocalyptic number.

66563604479 is a deficient number, since it is larger than the sum of its proper divisors (1).

66563604479 is an equidigital number, since it uses as much as digits as its factorization.

66563604479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19595520, while the sum is 56.

The spelling of 66563604479 in words is "sixty-six billion, five hundred sixty-three million, six hundred four thousand, four hundred seventy-nine".