2165743663 has 4 divisors (see below), whose sum is σ = 2167407088. Its totient is φ = 2164080240.

The previous prime is 2165743661. The next prime is 2165743729. The reversal of 2165743663 is 3663475612.

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 2165743663 - 2¹ = 2165743661 is a prime.

It is a super-2 number, since 2×2165743663² = 9380891227649315138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165743661) 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, 829758 + ... + 832363.

It is an arithmetic number, because the mean of its divisors is an integer number (541851772).

Almost surely, 2^2165743663 is an apocalyptic number.

2165743663 is a deficient number, since it is larger than the sum of its proper divisors (1663425).

2165743663 is a wasteful number, since it uses less digits than its factorization.

2165743663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663424.

The product of its digits is 544320, while the sum is 43.

The square root of 2165743663 is about 46537.5511066064. The cubic root of 2165743663 is about 1293.8055727939.

The spelling of 2165743663 in words is "two billion, one hundred sixty-five million, seven hundred forty-three thousand, six hundred sixty-three".