6661365165 has 48 divisors (see below), whose sum is σ = 14210921088. Its totient is φ = 2810947968.

The previous prime is 6661365107. The next prime is 6661365229. The reversal of 6661365165 is 5615631666.

It is not a de Polignac number, because 6661365165 - 2¹⁷ = 6661234093 is a prime.

It is a super-2 number, since 2×6661365165² = 88747571722950954450, which contains 22 as substring.

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

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 6661365165.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 809259 + ... + 817448.

It is an arithmetic number, because the mean of its divisors is an integer number (296060856).

Almost surely, 2^6661365165 is an apocalyptic number.

6661365165 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

6661365165 is an abundant number, since it is smaller than the sum of its proper divisors (7549555923).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661365165 is a wasteful number, since it uses less digits than its factorization.

6661365165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626738 (or 1626735 counting only the distinct ones).

The product of its digits is 583200, while the sum is 45.

The square root of 6661365165 is about 81617.1867010864. The cubic root of 6661365165 is about 1881.5730350526.

The spelling of 6661365165 in words is "six billion, six hundred sixty-one million, three hundred sixty-five thousand, one hundred sixty-five".