66734070336731 has 4 divisors (see below), whose sum is σ = 76267508956272. Its totient is φ = 57200631717192.

The previous prime is 66734070336707. The next prime is 66734070336763. The reversal of 66734070336731 is 13763307043766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66734070336731 - 2¹⁸ = 66734070074587 is a prime.

It is a super-2 number, since 2×66734070336731² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66734070306731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4766719309760 + ... + 4766719309773.

It is an arithmetic number, because the mean of its divisors is an integer number (19066877239068).

Almost surely, 2^{66734070336731} is an apocalyptic number.

66734070336731 is a deficient number, since it is larger than the sum of its proper divisors (9533438619541).

66734070336731 is an equidigital number, since it uses as much as digits as its factorization.

66734070336731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9533438619540.

The product of its (nonzero) digits is 24004512, while the sum is 56.

The spelling of 66734070336731 in words is "sixty-six trillion, seven hundred thirty-four billion, seventy million, three hundred thirty-six thousand, seven hundred thirty-one".