1622121665 has 4 divisors (see below), whose sum is σ = 1946546004. Its totient is φ = 1297697328.

The previous prime is 1622121653. The next prime is 1622121671. The reversal of 1622121665 is 5661212261.

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

It can be written as a sum of positive squares in 2 ways, for example, as 781817521 + 840304144 = 27961^2 + 28988^2 .

It is a cyclic number.

It is not a de Polignac number, because 1622121665 - 2⁴ = 1622121649 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162212162 + ... + 162212171.

It is an arithmetic number, because the mean of its divisors is an integer number (486636501).

Almost surely, 2^1622121665 is an apocalyptic number.

It is an amenable number.

1622121665 is a deficient number, since it is larger than the sum of its proper divisors (324424339).

1622121665 is an equidigital number, since it uses as much as digits as its factorization.

1622121665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324424338.

The product of its digits is 8640, while the sum is 32.

The square root of 1622121665 is about 40275.5715663974. The cubic root of 1622121665 is about 1174.9727870565.

The spelling of 1622121665 in words is "one billion, six hundred twenty-two million, one hundred twenty-one thousand, six hundred sixty-five".