66155322605 has 8 divisors (see below), whose sum is σ = 84056174712. Its totient is φ = 49811066368.

The previous prime is 66155322589. The next prime is 66155322617. The reversal of 66155322605 is 50622355166.

It can be written as a sum of positive squares in 4 ways, for example, as 23184934756 + 42970387849 = 152266^2 + 207293^2 .

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 66155322605 - 2⁴ = 66155322589 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 389148872 + ... + 389149041.

It is an arithmetic number, because the mean of its divisors is an integer number (10507021839).

Almost surely, 2^66155322605 is an apocalyptic number.

It is an amenable number.

66155322605 is a deficient number, since it is larger than the sum of its proper divisors (17900852107).

66155322605 is a wasteful number, since it uses less digits than its factorization.

66155322605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778297935.

The product of its (nonzero) digits is 324000, while the sum is 41.

The spelling of 66155322605 in words is "sixty-six billion, one hundred fifty-five million, three hundred twenty-two thousand, six hundred five".