2123665663 has 8 divisors (see below), whose sum is σ = 2554785920. Its totient is φ = 1724480280.

The previous prime is 2123665637. The next prime is 2123665667. The reversal of 2123665663 is 3665663212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2123665663 - 2²¹ = 2121568511 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123665667) 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, 7983573 + ... + 7983838.

It is an arithmetic number, because the mean of its divisors is an integer number (319348240).

Almost surely, 2^2123665663 is an apocalyptic number.

2123665663 is a deficient number, since it is larger than the sum of its proper divisors (431120257).

2123665663 is a wasteful number, since it uses less digits than its factorization.

2123665663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15967437.

The product of its digits is 233280, while the sum is 40.

The square root of 2123665663 is about 46083.2470969657. The cubic root of 2123665663 is about 1285.3716443848.

The spelling of 2123665663 in words is "two billion, one hundred twenty-three million, six hundred sixty-five thousand, six hundred sixty-three".