2165222642 has 12 divisors (see below), whose sum is σ = 3569933598. Its totient is φ = 984192000.

The previous prime is 2165222623. The next prime is 2165222681. The reversal of 2165222642 is 2462225612.

It can be written as a sum of positive squares in only one way, i.e., 1474636801 + 690585841 = 38401^2 + 26279^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2165222599 and 2165222608.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4473359 + ... + 4473842.

Almost surely, 2^2165222642 is an apocalyptic number.

2165222642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2165222642 is a deficient number, since it is larger than the sum of its proper divisors (1404710956).

2165222642 is a wasteful number, since it uses less digits than its factorization.

2165222642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8947225 (or 8947214 counting only the distinct ones).

The product of its digits is 23040, while the sum is 32.

The square root of 2165222642 is about 46531.9529140998. The cubic root of 2165222642 is about 1293.7018126015.

The spelling of 2165222642 in words is "two billion, one hundred sixty-five million, two hundred twenty-two thousand, six hundred forty-two".