42921835666 has 16 divisors (see below), whose sum is σ = 64508192640. Its totient is φ = 21419144560.

The previous prime is 42921835661. The next prime is 42921835667. The reversal of 42921835666 is 66653812924.

It is not an unprimeable number, because it can be changed into a prime (42921835661) 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, 2432865 + ... + 2450443.

It is an arithmetic number, because the mean of its divisors is an integer number (4031762040).

Almost surely, 2^42921835666 is an apocalyptic number.

42921835666 is a deficient number, since it is larger than the sum of its proper divisors (21586356974).

42921835666 is a wasteful number, since it uses less digits than its factorization.

42921835666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19889.

The product of its digits is 3732480, while the sum is 52.

The spelling of 42921835666 in words is "forty-two billion, nine hundred twenty-one million, eight hundred thirty-five thousand, six hundred sixty-six".