165497644800 has 540 divisors, whose sum is σ = 616844357976. Its totient is φ = 43777843200.

The previous prime is 165497644799. The next prime is 165497644801. The reversal of 165497644800 is 8446794561.

165497644800 is a `hidden beast` number, since 1 + 65 + 49 + 7 + 64 + 480 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (165497644799) and next prime (165497644801).

It is a tau number, because it is divible by the number of its divisors (540).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165497644801) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 67909182 + ... + 67911618.

Almost surely, 2^165497644800 is an apocalyptic number.

165497644800 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 165497644800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308422178988).

165497644800 is an abundant number, since it is smaller than the sum of its proper divisors (451346713176).

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

165497644800 is a wasteful number, since it uses less digits than its factorization.

165497644800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606 (or 2578 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 165497644800 in words is "one hundred sixty-five billion, four hundred ninety-seven million, six hundred forty-four thousand, eight hundred".