166420445620042 has 8 divisors (see below), whose sum is σ = 249895950758532. Its totient is φ = 83121795367200.

The previous prime is 166420445620001. The next prime is 166420445620049. The reversal of 166420445620042 is 240026544024661.

It can be written as a sum of positive squares in 2 ways, for example, as 161093438523081 + 5327007096961 = 12692259^2 + 2308031^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 166420445619974 and 166420445620001.

It is not an unprimeable number, because it can be changed into a prime (166420445620049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44213719059 + ... + 44213722822.

Almost surely, 2^{166420445620042} is an apocalyptic number.

166420445620042 is a deficient number, since it is larger than the sum of its proper divisors (83475505138490).

166420445620042 is an equidigital number, since it uses as much as digits as its factorization.

166420445620042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88427442824.

The product of its (nonzero) digits is 2211840, while the sum is 46.

The spelling of 166420445620042 in words is "one hundred sixty-six trillion, four hundred twenty billion, four hundred forty-five million, six hundred twenty thousand, forty-two".