165505820736 has 112 divisors (see below), whose sum is σ = 447195578048. Its totient is φ = 54006220800.

The previous prime is 165505820729. The next prime is 165505820759. The reversal of 165505820736 is 637028505561.

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, 2437746 + ... + 2504718.

Almost surely, 2^165505820736 is an apocalyptic number.

165505820736 is a gapful number since it is divisible by the number (16) 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 165505820736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (223597789024).

165505820736 is an abundant number, since it is smaller than the sum of its proper divisors (281689757312).

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

165505820736 is a wasteful number, since it uses less digits than its factorization.

165505820736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67260 (or 67250 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 165505820736 in words is "one hundred sixty-five billion, five hundred five million, eight hundred twenty thousand, seven hundred thirty-six".