66840197039 has 8 divisors (see below), whose sum is σ = 83333232768. Its totient is φ = 52083270360.

The previous prime is 66840197003. The next prime is 66840197051. The reversal of 66840197039 is 93079104866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66840197039 - 2¹⁶ = 66840131503 is a prime.

It is a super-2 number, since 2×66840197039² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66840197839) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 434027177 + ... + 434027330.

It is an arithmetic number, because the mean of its divisors is an integer number (10416654096).

Almost surely, 2^66840197039 is an apocalyptic number.

66840197039 is a deficient number, since it is larger than the sum of its proper divisors (16493035729).

66840197039 is a wasteful number, since it uses less digits than its factorization.

66840197039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 868054525.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 66840197039 in words is "sixty-six billion, eight hundred forty million, one hundred ninety-seven thousand, thirty-nine".