42021145666 has 8 divisors (see below), whose sum is σ = 66739466700. Its totient is φ = 19774656768.

The previous prime is 42021145657. The next prime is 42021145679. The reversal of 42021145666 is 66654112024.

It can be written as a sum of positive squares in 2 ways, for example, as 41995895041 + 25250625 = 204929^2 + 5025^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617957991 + ... + 617958058.

Almost surely, 2^42021145666 is an apocalyptic number.

42021145666 is a deficient number, since it is larger than the sum of its proper divisors (24718321034).

42021145666 is a wasteful number, since it uses less digits than its factorization.

42021145666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235916068.

The product of its (nonzero) digits is 69120, while the sum is 37.

The spelling of 42021145666 in words is "forty-two billion, twenty-one million, one hundred forty-five thousand, six hundred sixty-six".