66690734467 has 4 divisors (see below), whose sum is σ = 76217982256. Its totient is φ = 57163486680.

The previous prime is 66690734447. The next prime is 66690734479. The reversal of 66690734467 is 76443709666.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76443709666 = 2 ⋅38221854833.

It is a cyclic number.

It is not a de Polignac number, because 66690734467 - 2²³ = 66682345859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66690734417) 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 3 ways as a sum of consecutive naturals, for example, 4763623884 + ... + 4763623897.

It is an arithmetic number, because the mean of its divisors is an integer number (19054495564).

Almost surely, 2^66690734467 is an apocalyptic number.

66690734467 is a deficient number, since it is larger than the sum of its proper divisors (9527247789).

66690734467 is an equidigital number, since it uses as much as digits as its factorization.

66690734467 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9527247788.

The product of its (nonzero) digits is 27433728, while the sum is 58.

The spelling of 66690734467 in words is "sixty-six billion, six hundred ninety million, seven hundred thirty-four thousand, four hundred sixty-seven".