165620123366464 has 112 divisors (see below), whose sum is σ = 355747730108400. Its totient is φ = 76049156284416.

The previous prime is 165620123366431. The next prime is 165620123366507. The reversal of 165620123366464 is 464663321026561.

It can be written as a sum of positive squares in 8 ways, for example, as 15322527360000 + 150297596006464 = 3914400^2 + 12259592^2 .

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, 133628842 + ... + 134862550.

It is an arithmetic number, because the mean of its divisors is an integer number (3176319018825).

Almost surely, 2^{165620123366464} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 165620123366464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (177873865054200).

165620123366464 is an abundant number, since it is smaller than the sum of its proper divisors (190127606741936).

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

165620123366464 is a wasteful number, since it uses less digits than its factorization.

165620123366464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1234560 (or 1234550 counting only the distinct ones).

The product of its (nonzero) digits is 22394880, while the sum is 55.

The spelling of 165620123366464 in words is "one hundred sixty-five trillion, six hundred twenty billion, one hundred twenty-three million, three hundred sixty-six thousand, four hundred sixty-four".