66613626511 has 2 divisors, whose sum is σ = 66613626512. Its totient is φ = 66613626510.

The previous prime is 66613626451. The next prime is 66613626539. The reversal of 66613626511 is 11562631666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66613626511 - 2²⁵ = 66580072079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66613626551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33306813255 + 33306813256.

It is an arithmetic number, because the mean of its divisors is an integer number (33306813256).

Almost surely, 2^66613626511 is an apocalyptic number.

66613626511 is a deficient number, since it is larger than the sum of its proper divisors (1).

66613626511 is an equidigital number, since it uses as much as digits as its factorization.

66613626511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The spelling of 66613626511 in words is "sixty-six billion, six hundred thirteen million, six hundred twenty-six thousand, five hundred eleven".