165544902120 has 512 divisors, whose sum is σ = 576892108800. Its totient is φ = 37685649408.

The previous prime is 165544902079. The next prime is 165544902121. The reversal of 165544902120 is 21209445561.

It is a super-2 number, since 2×165544902120² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (165544902121) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 150085489 + ... + 150086591.

It is an arithmetic number, because the mean of its divisors is an integer number (1126742400).

Almost surely, 2^165544902120 is an apocalyptic number.

165544902120 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 165544902120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288446054400).

165544902120 is an abundant number, since it is smaller than the sum of its proper divisors (411347206680).

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

165544902120 is a wasteful number, since it uses less digits than its factorization.

165544902120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1289 (or 1285 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 165544902120 in words is "one hundred sixty-five billion, five hundred forty-four million, nine hundred two thousand, one hundred twenty".