66868474771 has 32 divisors (see below), whose sum is σ = 80812592640. Its totient is φ = 54050540544.

The previous prime is 66868474759. The next prime is 66868474811. The reversal of 66868474771 is 17747486866.

It is not a de Polignac number, because 66868474771 - 2¹⁹ = 66867950483 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66868472771) 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, 41455161 + ... + 41456773.

It is an arithmetic number, because the mean of its divisors is an integer number (2525393520).

Almost surely, 2^66868474771 is an apocalyptic number.

66868474771 is a deficient number, since it is larger than the sum of its proper divisors (13944117869).

66868474771 is a wasteful number, since it uses less digits than its factorization.

66868474771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2875.

The product of its digits is 75866112, while the sum is 64.

The spelling of 66868474771 in words is "sixty-six billion, eight hundred sixty-eight million, four hundred seventy-four thousand, seven hundred seventy-one".