166885742205 has 640 divisors, whose sum is σ = 419132786688. Its totient is φ = 61487382528.

The previous prime is 166885742203. The next prime is 166885742249. The reversal of 166885742205 is 502247588661.

166885742205 is a `hidden beast` number, since 1 + 6 + 68 + 8 + 574 + 2 + 2 + 0 + 5 = 666.

It is not a de Polignac number, because 166885742205 - 2¹ = 166885742203 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166885742201) by changing a digit.

It is a polite number, since it can be written in 639 ways as a sum of consecutive naturals, for example, 533181129 + ... + 533181441.

Almost surely, 2^166885742205 is an apocalyptic number.

166885742205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166885742205 is an abundant number, since it is smaller than the sum of its proper divisors (252247044483).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

166885742205 is a wasteful number, since it uses less digits than its factorization.

166885742205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 418 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 166885742205 in words is "one hundred sixty-six billion, eight hundred eighty-five million, seven hundred forty-two thousand, two hundred five".