1006666623 has 14 divisors (see below), whose sum is σ = 1509310584. Its totient is φ = 671110596.

The previous prime is 1006666621. The next prime is 1006666637. The reversal of 1006666623 is 3266666001.

It is not a de Polignac number, because 1006666623 - 2¹ = 1006666621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1006666621) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 689715 + ... + 691172.

Almost surely, 2^1006666623 is an apocalyptic number.

1006666623 is a deficient number, since it is larger than the sum of its proper divisors (502643961).

1006666623 is an frugal number, since it uses more digits than its factorization.

1006666623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1380905 (or 1380890 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 1006666623 is about 31728.0100699681. The cubic root of 1006666623 is about 1002.2172876684.

The spelling of 1006666623 in words is "one billion, six million, six hundred sixty-six thousand, six hundred twenty-three".