1642646647 has 2 divisors, whose sum is σ = 1642646648. Its totient is φ = 1642646646.

The previous prime is 1642646633. The next prime is 1642646651. The reversal of 1642646647 is 7466462461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1642646647 - 2¹¹ = 1642644599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1642646597 and 1642646606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642646627) 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, 821323323 + 821323324.

It is an arithmetic number, because the mean of its divisors is an integer number (821323324).

Almost surely, 2^1642646647 is an apocalyptic number.

1642646647 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642646647 is an equidigital number, since it uses as much as digits as its factorization.

1642646647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1161216, while the sum is 46.

The square root of 1642646647 is about 40529.5774342640. The cubic root of 1642646647 is about 1179.9077412787.

The spelling of 1642646647 in words is "one billion, six hundred forty-two million, six hundred forty-six thousand, six hundred forty-seven".