165227166720 has 528 divisors, whose sum is σ = 713791323648. Its totient is φ = 34332180480.

The previous prime is 165227166679. The next prime is 165227166773. The reversal of 165227166720 is 27661722561.

It is a tau number, because it is divible by the number of its divisors (528).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3524877 + ... + 3571443.

Almost surely, 2^165227166720 is an apocalyptic number.

165227166720 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 165227166720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (356895661824).

165227166720 is an abundant number, since it is smaller than the sum of its proper divisors (548564156928).

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

165227166720 is a wasteful number, since it uses less digits than its factorization.

165227166720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46616 (or 46595 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 165227166720 in words is "one hundred sixty-five billion, two hundred twenty-seven million, one hundred sixty-six thousand, seven hundred twenty".