42065515666 has 16 divisors (see below), whose sum is σ = 66829937760. Its totient is φ = 19789610560.

The previous prime is 42065515663. The next prime is 42065515669. The reversal of 42065515666 is 66651556024.

It is an interprime number because it is at equal distance from previous prime (42065515663) and next prime (42065515669).

It is not an unprimeable number, because it can be changed into a prime (42065515663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68896 + ... + 298123.

It is an arithmetic number, because the mean of its divisors is an integer number (4176871110).

Almost surely, 2^42065515666 is an apocalyptic number.

42065515666 is a deficient number, since it is larger than the sum of its proper divisors (24764422094).

42065515666 is a wasteful number, since it uses less digits than its factorization.

42065515666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370409.

The product of its (nonzero) digits is 1296000, while the sum is 46.

The spelling of 42065515666 in words is "forty-two billion, sixty-five million, five hundred fifteen thousand, six hundred sixty-six".