165520128040 has 32 divisors (see below), whose sum is σ = 394327365480. Its totient is φ = 62313459712.

The previous prime is 165520128031. The next prime is 165520128073. The reversal of 165520128040 is 40821025561.

It is a happy number.

165520128040 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 149835571396 + 15684556644 = 387086^2 + 125238^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 165520127987 and 165520128005.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121705297 + ... + 121706656.

Almost surely, 2^165520128040 is an apocalyptic number.

165520128040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

165520128040 is an abundant number, since it is smaller than the sum of its proper divisors (228807237440).

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

165520128040 is a wasteful number, since it uses less digits than its factorization.

165520128040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243411981 (or 243411977 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 34.

The spelling of 165520128040 in words is "one hundred sixty-five billion, five hundred twenty million, one hundred twenty-eight thousand, forty".