166821260960 has 24 divisors (see below), whose sum is σ = 394115229396. Its totient is φ = 66728504320.

The previous prime is 166821260959. The next prime is 166821260971. The reversal of 166821260960 is 69062128661.

166821260960 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 146587905424 + 20233355536 = 382868^2 + 142244^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 521316281 + ... + 521316600.

Almost surely, 2^166821260960 is an apocalyptic number.

166821260960 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166821260960 is an abundant number, since it is smaller than the sum of its proper divisors (227293968436).

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

166821260960 is a wasteful number, since it uses less digits than its factorization.

166821260960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042632896 (or 1042632888 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 166821260960 in words is "one hundred sixty-six billion, eight hundred twenty-one million, two hundred sixty thousand, nine hundred sixty".