166209285735804 has 24 divisors (see below), whose sum is σ = 387821877499728. Its totient is φ = 55403065133440.

The previous prime is 166209285735793. The next prime is 166209285735809. The reversal of 166209285735804 is 408537582902661.

It is a super-2 number, since 2×166209285735804² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166209285735809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36250534 + ... + 40577330.

It is an arithmetic number, because the mean of its divisors is an integer number (16159244895822).

It is a 1-persistent number, because it is pandigital, but 2⋅166209285735804 = 332418571471608 is not.

Almost surely, 2^{166209285735804} is an apocalyptic number.

It is an amenable number.

166209285735804 is an abundant number, since it is smaller than the sum of its proper divisors (221612591763924).

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

166209285735804 is a wasteful number, since it uses less digits than its factorization.

166209285735804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7527965 (or 7527963 counting only the distinct ones).

The product of its (nonzero) digits is 174182400, while the sum is 66.

The spelling of 166209285735804 in words is "one hundred sixty-six trillion, two hundred nine billion, two hundred eighty-five million, seven hundred thirty-five thousand, eight hundred four".