42942190666 has 8 divisors (see below), whose sum is σ = 64823562180. Its totient is φ = 21334336608.

The previous prime is 42942190663. The next prime is 42942190691. The reversal of 42942190666 is 66609124924.

It can be written as a sum of positive squares in 2 ways, for example, as 42695543641 + 246647025 = 206629^2 + 15705^2 .

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

It is not an unprimeable number, because it can be changed into a prime (42942190661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68378971 + ... + 68379598.

Almost surely, 2^42942190666 is an apocalyptic number.

42942190666 is a deficient number, since it is larger than the sum of its proper divisors (21881371514).

42942190666 is a wasteful number, since it uses less digits than its factorization.

42942190666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136758728.

The product of its (nonzero) digits is 1119744, while the sum is 49.

The spelling of 42942190666 in words is "forty-two billion, nine hundred forty-two million, one hundred ninety thousand, six hundred sixty-six".