165621634752 has 112 divisors (see below), whose sum is σ = 501158857472. Its totient is φ = 47287342080.

The previous prime is 165621634681. The next prime is 165621634771. The reversal of 165621634752 is 257436126561.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1910427 + ... + 1995237.

It is an arithmetic number, because the mean of its divisors is an integer number (4474632656).

Almost surely, 2^165621634752 is an apocalyptic number.

165621634752 is a gapful number since it is divisible by the number (12) 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 165621634752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250579428736).

165621634752 is an abundant number, since it is smaller than the sum of its proper divisors (335537222720).

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

165621634752 is a wasteful number, since it uses less digits than its factorization.

165621634752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86286 (or 86276 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 48.

The spelling of 165621634752 in words is "one hundred sixty-five billion, six hundred twenty-one million, six hundred thirty-four thousand, seven hundred fifty-two".