166001506165578 has 16 divisors (see below), whose sum is σ = 332146674415296. Its totient is φ = 55309891707840.

The previous prime is 166001506165577. The next prime is 166001506165633. The reversal of 166001506165578 is 875561605100661.

It is not an unprimeable number, because it can be changed into a prime (166001506165577) 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, 5985905151 + ... + 5985932882.

It is an arithmetic number, because the mean of its divisors is an integer number (20759167150956).

Almost surely, 2^{166001506165578} is an apocalyptic number.

166001506165578 is an abundant number, since it is smaller than the sum of its proper divisors (166145168249718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166001506165578 is a wasteful number, since it uses less digits than its factorization.

166001506165578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11971840349.

The product of its (nonzero) digits is 9072000, while the sum is 57.

The spelling of 166001506165578 in words is "one hundred sixty-six trillion, one billion, five hundred six million, one hundred sixty-five thousand, five hundred seventy-eight".