2002165623 has 12 divisors (see below), whose sum is σ = 2935182328. Its totient is φ = 1314854640.

The previous prime is 2002165619. The next prime is 2002165637. The reversal of 2002165623 is 3265612002.

2002165623 is a `hidden beast` number, since 2 + 0 + 0 + 2 + 1 + 656 + 2 + 3 = 666.

It is not a de Polignac number, because 2002165623 - 2² = 2002165619 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 (2002163623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1659568 + ... + 1660773.

Almost surely, 2^2002165623 is an apocalyptic number.

2002165623 is a deficient number, since it is larger than the sum of its proper divisors (933016705).

2002165623 is a wasteful number, since it uses less digits than its factorization.

2002165623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320414 (or 3320411 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 2002165623 is about 44745.5654003835. The cubic root of 2002165623 is about 1260.3756381905.

Adding to 2002165623 its reverse (3265612002), we get a palindrome (5267777625).

The spelling of 2002165623 in words is "two billion, two million, one hundred sixty-five thousand, six hundred twenty-three".