165551156144532 has 36 divisors (see below), whose sum is σ = 432906758886420. Its totient is φ = 53280831862272.

The previous prime is 165551156144519. The next prime is 165551156144533. The reversal of 165551156144532 is 235441651155561.

165551156144532 is a `hidden beast` number, since 1 + 6 + 5 + 5 + 5 + 1 + 1 + 5 + 61 + 44 + 532 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 128642687989776 + 36908468154756 = 11342076^2 + 6075234^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165551156144533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79286951133 + ... + 79286953220.

It is an arithmetic number, because the mean of its divisors is an integer number (12025187746845).

Almost surely, 2^{165551156144532} is an apocalyptic number.

165551156144532 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

165551156144532 is an abundant number, since it is smaller than the sum of its proper divisors (267355602741888).

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

165551156144532 is a wasteful number, since it uses less digits than its factorization.

165551156144532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158573904392 (or 158573904387 counting only the distinct ones).

The product of its digits is 10800000, while the sum is 54.

The spelling of 165551156144532 in words is "one hundred sixty-five trillion, five hundred fifty-one billion, one hundred fifty-six million, one hundred forty-four thousand, five hundred thirty-two".