66571993089 has 48 divisors (see below), whose sum is σ = 111783095424. Its totient is φ = 37389081600.

The previous prime is 66571993051. The next prime is 66571993121. The reversal of 66571993089 is 98039917566.

It is a Cullen number, since it is equal to 31×2³¹+1.

It is not a de Polignac number, because 66571993089 - 2²⁹ = 66035122177 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (66571993039) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 5693329 + ... + 5705009.

It is an arithmetic number, because the mean of its divisors is an integer number (2328814488).

It is a Proth number, since it is equal to 31 ⋅ 2³¹ + 1 and 31 < 2³¹.

Almost surely, 2^66571993089 is an apocalyptic number.

It is an amenable number.

66571993089 is a deficient number, since it is larger than the sum of its proper divisors (45211102335).

66571993089 is a wasteful number, since it uses less digits than its factorization.

66571993089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13238 (or 13235 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 66571993089 in words is "sixty-six billion, five hundred seventy-one million, nine hundred ninety-three thousand, eighty-nine".