166020421363 has 4 divisors (see below), whose sum is σ = 175786328520. Its totient is φ = 156254514208.

The previous prime is 166020421349. The next prime is 166020421367. The reversal of 166020421363 is 363124020661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 166020421363 - 2¹⁷ = 166020290291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166020421367) 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, 4882953553 + ... + 4882953586.

It is an arithmetic number, because the mean of its divisors is an integer number (43946582130).

Almost surely, 2^166020421363 is an apocalyptic number.

166020421363 is a deficient number, since it is larger than the sum of its proper divisors (9765907157).

166020421363 is an equidigital number, since it uses as much as digits as its factorization.

166020421363 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9765907156.

The product of its (nonzero) digits is 31104, while the sum is 34.

The spelling of 166020421363 in words is "one hundred sixty-six billion, twenty million, four hundred twenty-one thousand, three hundred sixty-three".