166665065506 has 8 divisors (see below), whose sum is σ = 251306486784. Its totient is φ = 82896236580.

The previous prime is 166665065461. The next prime is 166665065513. The reversal of 166665065506 is 605560566661.

166665065506 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 218147610 + ... + 218148373.

It is an arithmetic number, because the mean of its divisors is an integer number (31413310848).

Almost surely, 2^166665065506 is an apocalyptic number.

166665065506 is a deficient number, since it is larger than the sum of its proper divisors (84641421278).

166665065506 is a wasteful number, since it uses less digits than its factorization.

166665065506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436296176.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 166665065506 in words is "one hundred sixty-six billion, six hundred sixty-five million, sixty-five thousand, five hundred six".