1662025643 has 2 divisors, whose sum is σ = 1662025644. Its totient is φ = 1662025642.

The previous prime is 1662025597. The next prime is 1662025669. The reversal of 1662025643 is 3465202661.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1662025643 - 2¹⁶ = 1661960107 is a prime.

It is not a weakly prime, because it can be changed into another prime (1662025843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831012821 + 831012822.

It is an arithmetic number, because the mean of its divisors is an integer number (831012822).

Almost surely, 2^1662025643 is an apocalyptic number.

1662025643 is a deficient number, since it is larger than the sum of its proper divisors (1).

1662025643 is an equidigital number, since it uses as much as digits as its factorization.

1662025643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 1662025643 is about 40767.9487220046. The cubic root of 1662025643 is about 1184.5295700160.

The spelling of 1662025643 in words is "one billion, six hundred sixty-two million, twenty-five thousand, six hundred forty-three".