165215122546553 has 4 divisors (see below), whose sum is σ = 165222601411728. Its totient is φ = 165207643681380.

The previous prime is 165215122546549. The next prime is 165215122546697. The reversal of 165215122546553 is 355645221512561.

165215122546553 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165215122546553 - 2² = 165215122546549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165215122546495 and 165215122546504.

It is not an unprimeable number, because it can be changed into a prime (165215122540553) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3739399451 + ... + 3739443632.

It is an arithmetic number, because the mean of its divisors is an integer number (41305650352932).

Almost surely, 2^{165215122546553} is an apocalyptic number.

It is an amenable number.

165215122546553 is a deficient number, since it is larger than the sum of its proper divisors (7478865175).

165215122546553 is an equidigital number, since it uses as much as digits as its factorization.

165215122546553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7478865174.

The product of its digits is 10800000, while the sum is 53.

The spelling of 165215122546553 in words is "one hundred sixty-five trillion, two hundred fifteen billion, one hundred twenty-two million, five hundred forty-six thousand, five hundred fifty-three".