165823840656 has 80 divisors (see below), whose sum is σ = 503974440000. Its totient is φ = 52023163392.

The previous prime is 165823840649. The next prime is 165823840657. The reversal of 165823840656 is 656048328561.

165823840656 is a `hidden beast` number, since 1 + 6 + 582 + 3 + 8 + 4 + 0 + 6 + 56 = 666.

It is a super-2 number, since 2×165823840656² (a number of 23 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (165823840657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11282406 + ... + 11297093.

It is an arithmetic number, because the mean of its divisors is an integer number (6299680500).

Almost surely, 2^165823840656 is an apocalyptic number.

165823840656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

165823840656 is an abundant number, since it is smaller than the sum of its proper divisors (338150599344).

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

165823840656 is a wasteful number, since it uses less digits than its factorization.

165823840656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22579533 (or 22579521 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 165823840656 in words is "one hundred sixty-five billion, eight hundred twenty-three million, eight hundred forty thousand, six hundred fifty-six".