166116404160421 has 24 divisors (see below), whose sum is σ = 196638516520992. Its totient is φ = 139396739776800.

The previous prime is 166116404160403. The next prime is 166116404160431. The reversal of 166116404160421 is 124061404611661.

It is not a de Polignac number, because 166116404160421 - 2⁷ = 166116404160293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166116404160431) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143654070 + ... + 144805816.

It is an arithmetic number, because the mean of its divisors is an integer number (8193271521708).

Almost surely, 2^{166116404160421} is an apocalyptic number.

166116404160421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

166116404160421 is a deficient number, since it is larger than the sum of its proper divisors (30522112360571).

166116404160421 is a wasteful number, since it uses less digits than its factorization.

166116404160421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1243473 (or 1243462 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The spelling of 166116404160421 in words is "one hundred sixty-six trillion, one hundred sixteen billion, four hundred four million, one hundred sixty thousand, four hundred twenty-one".