165620623860 has 240 divisors, whose sum is σ = 547441171200. Its totient is φ = 41799856896.

The previous prime is 165620623813. The next prime is 165620623951. The reversal of 165620623860 is 68326026561.

165620623860 is a `hidden beast` number, since 1 + 6 + 562 + 0 + 6 + 2 + 3 + 86 + 0 = 666.

165620623860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 42258981 + ... + 42262899.

It is an arithmetic number, because the mean of its divisors is an integer number (2281004880).

Almost surely, 2^165620623860 is an apocalyptic number.

165620623860 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 165620623860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (273720585600).

165620623860 is an abundant number, since it is smaller than the sum of its proper divisors (381820547340).

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

165620623860 is a wasteful number, since it uses less digits than its factorization.

165620623860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5332 (or 5321 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 165620623860 in words is "one hundred sixty-five billion, six hundred twenty million, six hundred twenty-three thousand, eight hundred sixty".