2165566151361 has 4 divisors (see below), whose sum is σ = 2887421535152. Its totient is φ = 1443710767572.

The previous prime is 2165566151237. The next prime is 2165566151363. The reversal of 2165566151361 is 1631516655612.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2165566151361 - 2¹⁵ = 2165566118593 is a prime.

It is a super-3 number, since 3×2165566151361³ (a number of 38 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2165566151361.

It is not an unprimeable number, because it can be changed into a prime (2165566151363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360927691891 + ... + 360927691896.

It is an arithmetic number, because the mean of its divisors is an integer number (721855383788).

Almost surely, 2^{2165566151361} is an apocalyptic number.

It is an amenable number.

2165566151361 is a deficient number, since it is larger than the sum of its proper divisors (721855383791).

2165566151361 is an equidigital number, since it uses as much as digits as its factorization.

2165566151361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721855383790.

The product of its digits is 972000, while the sum is 48.

The spelling of 2165566151361 in words is "two trillion, one hundred sixty-five billion, five hundred sixty-six million, one hundred fifty-one thousand, three hundred sixty-one".