66213403067 has 4 divisors (see below), whose sum is σ = 75672460656. Its totient is φ = 56754345480.

The previous prime is 66213403027. The next prime is 66213403073. The reversal of 66213403067 is 76030431266.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76030431266 = 2 ⋅38015215633.

It is a de Polignac number, because none of the positive numbers 2^k-66213403067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66213403067.

It is not an unprimeable number, because it can be changed into a prime (66213403027) 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, 4729528784 + ... + 4729528797.

It is an arithmetic number, because the mean of its divisors is an integer number (18918115164).

Almost surely, 2^66213403067 is an apocalyptic number.

66213403067 is a deficient number, since it is larger than the sum of its proper divisors (9459057589).

66213403067 is an equidigital number, since it uses as much as digits as its factorization.

66213403067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9459057588.

The product of its (nonzero) digits is 108864, while the sum is 38.

The spelling of 66213403067 in words is "sixty-six billion, two hundred thirteen million, four hundred three thousand, sixty-seven".