1005665620165 has 8 divisors (see below), whose sum is σ = 1221338488608. Its totient is φ = 794839333200.

The previous prime is 1005665620147. The next prime is 1005665620171. The reversal of 1005665620165 is 5610265665001.

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

It is not a de Polignac number, because 1005665620165 - 2⁵ = 1005665620133 is a prime.

It is a super-2 number, since 2×1005665620165² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1211644911 + ... + 1211645740.

It is an arithmetic number, because the mean of its divisors is an integer number (152667311076).

Almost surely, 2^{1005665620165} is an apocalyptic number.

It is an amenable number.

1005665620165 is a deficient number, since it is larger than the sum of its proper divisors (215672868443).

1005665620165 is an equidigital number, since it uses as much as digits as its factorization.

1005665620165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423290739.

The product of its (nonzero) digits is 324000, while the sum is 43.

The spelling of 1005665620165 in words is "one trillion, five billion, six hundred sixty-five million, six hundred twenty thousand, one hundred sixty-five".