66919419065 has 8 divisors (see below), whose sum is σ = 81205587720. Its totient is φ = 52934012032.

The previous prime is 66919419043. The next prime is 66919419071. The reversal of 66919419065 is 56091491966.

It can be written as a sum of positive squares in 4 ways, for example, as 7814029609 + 59105389456 = 88397^2 + 243116^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 66919419065 - 2⁶ = 66919419001 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66919419065.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75189914 + ... + 75190803.

It is an arithmetic number, because the mean of its divisors is an integer number (10150698465).

Almost surely, 2^66919419065 is an apocalyptic number.

It is an amenable number.

66919419065 is a deficient number, since it is larger than the sum of its proper divisors (14286168655).

66919419065 is a wasteful number, since it uses less digits than its factorization.

66919419065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150380811.

The product of its (nonzero) digits is 3149280, while the sum is 56.

The spelling of 66919419065 in words is "sixty-six billion, nine hundred nineteen million, four hundred nineteen thousand, sixty-five".