165421056000 has 544 divisors, whose sum is σ = 565320757248. Its totient is φ = 42939187200.

The previous prime is 165421055971. The next prime is 165421056037. The reversal of 165421056000 is 650124561.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1302527937 + ... + 1302528063.

Almost surely, 2^165421056000 is an apocalyptic number.

165421056000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165421056000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282660378624).

165421056000 is an abundant number, since it is smaller than the sum of its proper divisors (399899701248).

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

165421056000 is an frugal number, since it uses more digits than its factorization.

165421056000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

The spelling of 165421056000 in words is "one hundred sixty-five billion, four hundred twenty-one million, fifty-six thousand".