66513263563 has 2 divisors, whose sum is σ = 66513263564. Its totient is φ = 66513263562.

The previous prime is 66513263449. The next prime is 66513263603. The reversal of 66513263563 is 36536231566.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66513263563 - 2⁹ = 66513263051 is a prime.

It is a super-2 number, since 2×66513263563² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66513263263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33256631781 + 33256631782.

It is an arithmetic number, because the mean of its divisors is an integer number (33256631782).

Almost surely, 2^66513263563 is an apocalyptic number.

66513263563 is a deficient number, since it is larger than the sum of its proper divisors (1).

66513263563 is an equidigital number, since it uses as much as digits as its factorization.

66513263563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1749600, while the sum is 46.

The spelling of 66513263563 in words is "sixty-six billion, five hundred thirteen million, two hundred sixty-three thousand, five hundred sixty-three".