166538446336081 has 8 divisors (see below), whose sum is σ = 167850425692160. Its totient is φ = 165226477183488.

The previous prime is 166538446336061. The next prime is 166538446336091. The reversal of 166538446336081 is 180633644835661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166538446336081 - 2⁷ = 166538446335953 is a prime.

It is a super-2 number, since 2×166538446336081² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166538446336051) 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, 32064040 + ... + 36894166.

It is an arithmetic number, because the mean of its divisors is an integer number (20981303211520).

Almost surely, 2^{166538446336081} is an apocalyptic number.

It is an amenable number.

166538446336081 is a deficient number, since it is larger than the sum of its proper divisors (1311979356079).

166538446336081 is a wasteful number, since it uses less digits than its factorization.

166538446336081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5101743.

The product of its (nonzero) digits is 179159040, while the sum is 64.

The spelling of 166538446336081 in words is "one hundred sixty-six trillion, five hundred thirty-eight billion, four hundred forty-six million, three hundred thirty-six thousand, eighty-one".