2081165819 has 4 divisors (see below), whose sum is σ = 2081368800. Its totient is φ = 2080962840.

The previous prime is 2081165813. The next prime is 2081165839. The reversal of 2081165819 is 9185611802.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2081165819 - 2⁴ = 2081165803 is a prime.

It is a super-2 number, since 2×2081165819² = 8662502332347881522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2081165813) 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, 85244 + ... + 106905.

It is an arithmetic number, because the mean of its divisors is an integer number (520342200).

Almost surely, 2^2081165819 is an apocalyptic number.

2081165819 is a deficient number, since it is larger than the sum of its proper divisors (202981).

2081165819 is a wasteful number, since it uses less digits than its factorization.

2081165819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202980.

The product of its (nonzero) digits is 34560, while the sum is 41.

The square root of 2081165819 is about 45619.7963498304. The cubic root of 2081165819 is about 1276.7393038437.

The spelling of 2081165819 in words is "two billion, eighty-one million, one hundred sixty-five thousand, eight hundred nineteen".