1006666542 has 80 divisors (see below), whose sum is σ = 2614436352. Its totient is φ = 283545360.

The previous prime is 1006666541. The next prime is 1006666559. The reversal of 1006666542 is 2456666001.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1006666497 and 1006666506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1006666541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 74263 + ... + 86765.

Almost surely, 2^1006666542 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1006666542, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1307218176).

1006666542 is an abundant number, since it is smaller than the sum of its proper divisors (1607769810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1006666542 is a wasteful number, since it uses less digits than its factorization.

1006666542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12595 (or 12586 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 1006666542 is about 31728.0087934935. The cubic root of 1006666542 is about 1002.2172607877.

The spelling of 1006666542 in words is "one billion, six million, six hundred sixty-six thousand, five hundred forty-two".