166021357641 has 8 divisors (see below), whose sum is σ = 221589787104. Its totient is φ = 110566916640.

The previous prime is 166021357633. The next prime is 166021357673. The reversal of 166021357641 is 146753120661.

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

It is not a de Polignac number, because 166021357641 - 2³ = 166021357633 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 166021357593 and 166021357602.

It is not an unprimeable number, because it can be changed into a prime (166021357741) 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, 28493716 + ... + 28499541.

It is an arithmetic number, because the mean of its divisors is an integer number (27698723388).

Almost surely, 2^166021357641 is an apocalyptic number.

It is an amenable number.

166021357641 is a deficient number, since it is larger than the sum of its proper divisors (55568429463).

166021357641 is an equidigital number, since it uses as much as digits as its factorization.

166021357641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56994231.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 166021357641 in words is "one hundred sixty-six billion, twenty-one million, three hundred fifty-seven thousand, six hundred forty-one".