1006640643 has 8 divisors (see below), whose sum is σ = 1342551808. Its totient is φ = 670911624.

The previous prime is 1006640633. The next prime is 1006640659. The reversal of 1006640643 is 3460466001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1006640643 - 2¹⁴ = 1006624259 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a self number, because there is not a number n which added to its sum of digits gives 1006640643.

It is not an unprimeable number, because it can be changed into a prime (1006640603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32071 + ... + 55152.

It is an arithmetic number, because the mean of its divisors is an integer number (167818976).

Almost surely, 2^1006640643 is an apocalyptic number.

1006640643 is a deficient number, since it is larger than the sum of its proper divisors (335911165).

1006640643 is an equidigital number, since it uses as much as digits as its factorization.

1006640643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91073.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 1006640643 is about 31727.6006499073. The cubic root of 1006640643 is about 1002.2086658703.

The spelling of 1006640643 in words is "one billion, six million, six hundred forty thousand, six hundred forty-three".