165161139456 has 72 divisors (see below), whose sum is σ = 439921208160. Its totient is φ = 55009662976.

The previous prime is 165161139419. The next prime is 165161139491. The reversal of 165161139456 is 654931161561.

165161139456 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×165161139456⁴ (a number of 46 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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 7 ways as a sum of consecutive naturals, for example, 881506 + ... + 1052318.

It is an arithmetic number, because the mean of its divisors is an integer number (6110016780).

Almost surely, 2^165161139456 is an apocalyptic number.

165161139456 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 165161139456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219960604080).

165161139456 is an abundant number, since it is smaller than the sum of its proper divisors (274760068704).

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

165161139456 is a wasteful number, since it uses less digits than its factorization.

165161139456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172091 (or 172077 counting only the distinct ones).

The product of its digits is 583200, while the sum is 48.

The spelling of 165161139456 in words is "one hundred sixty-five billion, one hundred sixty-one million, one hundred thirty-nine thousand, four hundred fifty-six".