66156320323305 has 24 divisors (see below), whose sum is σ = 114675906788352. Its totient is φ = 35281847281824.

The previous prime is 66156320323279. The next prime is 66156320323333. The reversal of 66156320323305 is 50332302365166.

It is a happy number.

66156320323305 is a `hidden beast` number, since 6 + 6 + 1 + 5 + 632 + 0 + 3 + 2 + 3 + 3 + 0 + 5 = 666.

It is not a de Polignac number, because 66156320323305 - 2⁹ = 66156320322793 is a prime.

It is a super-2 number, since 2×66156320323305² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30686679 + ... + 32771708.

It is an arithmetic number, because the mean of its divisors is an integer number (4778162782848).

Almost surely, 2^{66156320323305} is an apocalyptic number.

It is an amenable number.

66156320323305 is a deficient number, since it is larger than the sum of its proper divisors (48519586465047).

66156320323305 is a wasteful number, since it uses less digits than its factorization.

66156320323305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63481565 (or 63481562 counting only the distinct ones).

The product of its (nonzero) digits is 1749600, while the sum is 45.

The spelling of 66156320323305 in words is "sixty-six trillion, one hundred fifty-six billion, three hundred twenty million, three hundred twenty-three thousand, three hundred five".