66135189819 has 4 divisors (see below), whose sum is σ = 88180253096. Its totient is φ = 44090126544.

The previous prime is 66135189793. The next prime is 66135189877. The reversal of 66135189819 is 91898153166.

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

It is not a de Polignac number, because 66135189819 - 2²⁴ = 66118412603 is a prime.

It is a super-2 number, since 2×66135189819² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66135189889) 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, 11022531634 + ... + 11022531639.

It is an arithmetic number, because the mean of its divisors is an integer number (22045063274).

Almost surely, 2^66135189819 is an apocalyptic number.

66135189819 is a deficient number, since it is larger than the sum of its proper divisors (22045063277).

66135189819 is a wasteful number, since it uses less digits than its factorization.

66135189819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22045063276.

The product of its digits is 2799360, while the sum is 57.

The spelling of 66135189819 in words is "sixty-six billion, one hundred thirty-five million, one hundred eighty-nine thousand, eight hundred nineteen".