165551156144555 has 4 divisors (see below), whose sum is σ = 198661387373472. Its totient is φ = 132440924915640.

The previous prime is 165551156144533. The next prime is 165551156144603. The reversal of 165551156144555 is 555441651155561.

165551156144555 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 165551156144555 - 2²⁶ = 165551089035691 is a prime.

It is a super-2 number, since 2×165551156144555² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165551156144494 and 165551156144503.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16555115614451 + ... + 16555115614460.

It is an arithmetic number, because the mean of its divisors is an integer number (49665346843368).

Almost surely, 2^{165551156144555} is an apocalyptic number.

165551156144555 is a deficient number, since it is larger than the sum of its proper divisors (33110231228917).

165551156144555 is an equidigital number, since it uses as much as digits as its factorization.

165551156144555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33110231228916.

The product of its digits is 45000000, while the sum is 59.

The spelling of 165551156144555 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 fifty-five".