66513276619 has 2 divisors, whose sum is σ = 66513276620. Its totient is φ = 66513276618.

The previous prime is 66513276617. The next prime is 66513276647. The reversal of 66513276619 is 91667231566.

66513276619 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66513276619 - 2¹ = 66513276617 is a prime.

It is a super-2 number, since 2×66513276619² (a number of 22 digits) contains 22 as substring.

Together with 66513276617, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66513276617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33256638309 + 33256638310.

It is an arithmetic number, because the mean of its divisors is an integer number (33256638310).

Almost surely, 2^66513276619 is an apocalyptic number.

66513276619 is a deficient number, since it is larger than the sum of its proper divisors (1).

66513276619 is an equidigital number, since it uses as much as digits as its factorization.

66513276619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2449440, while the sum is 52.

The spelling of 66513276619 in words is "sixty-six billion, five hundred thirteen million, two hundred seventy-six thousand, six hundred nineteen".