66997026993 has 16 divisors (see below), whose sum is σ = 96738304320. Its totient is φ = 40998606144.

The previous prime is 66997026977. The next prime is 66997027033. The reversal of 66997026993 is 39962079966.

It is not a de Polignac number, because 66997026993 - 2⁴ = 66997026977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66997026893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4791546 + ... + 4805507.

It is an arithmetic number, because the mean of its divisors is an integer number (6046144020).

Almost surely, 2^66997026993 is an apocalyptic number.

It is an amenable number.

66997026993 is a deficient number, since it is larger than the sum of its proper divisors (29741277327).

66997026993 is a wasteful number, since it uses less digits than its factorization.

66997026993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9597248.

The product of its (nonzero) digits is 59521392, while the sum is 66.

The spelling of 66997026993 in words is "sixty-six billion, nine hundred ninety-seven million, twenty-six thousand, nine hundred ninety-three".