1006643551 has 2 divisors, whose sum is σ = 1006643552. Its totient is φ = 1006643550.

The previous prime is 1006643549. The next prime is 1006643567. The reversal of 1006643551 is 1553466001.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1006643551 - 2¹ = 1006643549 is a prime.

Together with 1006643549, it forms a pair of twin primes.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1006643581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 503321775 + 503321776.

It is an arithmetic number, because the mean of its divisors is an integer number (503321776).

Almost surely, 2^1006643551 is an apocalyptic number.

1006643551 is a deficient number, since it is larger than the sum of its proper divisors (1).

1006643551 is an equidigital number, since it uses as much as digits as its factorization.

1006643551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 1006643551 is about 31727.6464774808. The cubic root of 1006643551 is about 1002.2096309350.

The spelling of 1006643551 in words is "one billion, six million, six hundred forty-three thousand, five hundred fifty-one".