1620643223 has 2 divisors, whose sum is σ = 1620643224. Its totient is φ = 1620643222.

The previous prime is 1620643207. The next prime is 1620643249. The reversal of 1620643223 is 3223460261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1620643223 - 2⁴ = 1620643207 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1620643723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810321611 + 810321612.

It is an arithmetic number, because the mean of its divisors is an integer number (810321612).

Almost surely, 2^1620643223 is an apocalyptic number.

1620643223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1620643223 is an equidigital number, since it uses as much as digits as its factorization.

1620643223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 1620643223 is about 40257.2133039534. The cubic root of 1620643223 is about 1174.6157120856.

The spelling of 1620643223 in words is "one billion, six hundred twenty million, six hundred forty-three thousand, two hundred twenty-three".