66605651511 has 32 divisors (see below), whose sum is σ = 102518976000. Its totient is φ = 37677709440.

The previous prime is 66605651479. The next prime is 66605651531. The reversal of 66605651511 is 11515650666.

It is not a de Polignac number, because 66605651511 - 2⁵ = 66605651479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66605651531) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 986041 + ... + 1051421.

It is an arithmetic number, because the mean of its divisors is an integer number (3203718000).

Almost surely, 2^66605651511 is an apocalyptic number.

66605651511 is a deficient number, since it is larger than the sum of its proper divisors (35913324489).

66605651511 is a wasteful number, since it uses less digits than its factorization.

66605651511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65879.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 66605651511 in words is "sixty-six billion, six hundred five million, six hundred fifty-one thousand, five hundred eleven".