66665166616606 has 16 divisors (see below), whose sum is σ = 100550606333760. Its totient is φ = 33148450208160.

The previous prime is 66665166616589. The next prime is 66665166616639. The reversal of 66665166616606 is 60661666156666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37216086 + ... + 38966233.

It is an arithmetic number, because the mean of its divisors is an integer number (6284412895860).

Almost surely, 2^{66665166616606} is an apocalyptic number.

66665166616606 is a deficient number, since it is larger than the sum of its proper divisors (33885439717154).

66665166616606 is a wasteful number, since it uses less digits than its factorization.

66665166616606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76184739.

The product of its (nonzero) digits is 302330880, while the sum is 67.

The spelling of 66665166616606 in words is "sixty-six trillion, six hundred sixty-five billion, one hundred sixty-six million, six hundred sixteen thousand, six hundred six".