2165477541861 has 8 divisors (see below), whose sum is σ = 2887599046464. Its totient is φ = 1443503865920.

The previous prime is 2165477541827. The next prime is 2165477541869. The reversal of 2165477541861 is 1681457745612.

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 2165477541861 - 2²⁵ = 2165443987429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165477541869) by changing a digit.

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, 36922980 + ... + 36981581.

It is an arithmetic number, because the mean of its divisors is an integer number (360949880808).

Almost surely, 2^{2165477541861} is an apocalyptic number.

It is an amenable number.

2165477541861 is a deficient number, since it is larger than the sum of its proper divisors (722121504603).

2165477541861 is an equidigital number, since it uses as much as digits as its factorization.

2165477541861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73914331.

The product of its digits is 11289600, while the sum is 57.

The spelling of 2165477541861 in words is "two trillion, one hundred sixty-five billion, four hundred seventy-seven million, five hundred forty-one thousand, eight hundred sixty-one".