66945757529 has 16 divisors (see below), whose sum is σ = 81032934528. Its totient is φ = 53991366912.

The previous prime is 66945757517. The next prime is 66945757559. The reversal of 66945757529 is 92575754966.

It is not a de Polignac number, because 66945757529 - 2²⁰ = 66944708953 is a prime.

It is a super-2 number, since 2×66945757529² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66945757559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352094 + ... + 507800.

It is an arithmetic number, because the mean of its divisors is an integer number (5064558408).

Almost surely, 2^66945757529 is an apocalyptic number.

It is an amenable number.

66945757529 is a deficient number, since it is larger than the sum of its proper divisors (14087176999).

66945757529 is a wasteful number, since it uses less digits than its factorization.

66945757529 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159344.

The product of its digits is 142884000, while the sum is 65.

The spelling of 66945757529 in words is "sixty-six billion, nine hundred forty-five million, seven hundred fifty-seven thousand, five hundred twenty-nine".