1622847661 has 2 divisors, whose sum is σ = 1622847662. Its totient is φ = 1622847660.

The previous prime is 1622847643. The next prime is 1622847683. The reversal of 1622847661 is 1667482261.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1616522436 + 6325225 = 40206^2 + 2515^2 .

It is an emirp because it is prime and its reverse (1667482261) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1622847661 - 2⁷ = 1622847533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1622847461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 811423830 + 811423831.

It is an arithmetic number, because the mean of its divisors is an integer number (811423831).

Almost surely, 2^1622847661 is an apocalyptic number.

It is an amenable number.

1622847661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1622847661 is an equidigital number, since it uses as much as digits as its factorization.

1622847661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 1622847661 is about 40284.5834159918. The cubic root of 1622847661 is about 1175.1480509991.

The spelling of 1622847661 in words is "one billion, six hundred twenty-two million, eight hundred forty-seven thousand, six hundred sixty-one".