166828379520 has 128 divisors (see below), whose sum is σ = 580107847680. Its totient is φ = 40443238400.

The previous prime is 166828379413. The next prime is 166828379521. The reversal of 166828379520 is 25973828661.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166828379521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3928416 + ... + 3970655.

It is an arithmetic number, because the mean of its divisors is an integer number (4532092560).

Almost surely, 2^166828379520 is an apocalyptic number.

166828379520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166828379520 is an abundant number, since it is smaller than the sum of its proper divisors (413279468160).

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

166828379520 is a wasteful number, since it uses less digits than its factorization.

166828379520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7899104 (or 7899092 counting only the distinct ones).

The product of its (nonzero) digits is 8709120, while the sum is 57.

The spelling of 166828379520 in words is "one hundred sixty-six billion, eight hundred twenty-eight million, three hundred seventy-nine thousand, five hundred twenty".