161553126545265 has 32 divisors (see below), whose sum is σ = 318135387661056. Its totient is φ = 68171868783360.

The previous prime is 161553126545231. The next prime is 161553126545269. The reversal of 161553126545265 is 562545621355161.

161553126545265 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161553126545265 - 2¹⁰ = 161553126544241 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161553126545269) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 59176968066 + ... + 59176970795.

It is an arithmetic number, because the mean of its divisors is an integer number (9941730864408).

Almost surely, 2^{161553126545265} is an apocalyptic number.

161553126545265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161553126545265 is a deficient number, since it is larger than the sum of its proper divisors (156582261115791).

161553126545265 is a wasteful number, since it uses less digits than its factorization.

161553126545265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118353938889.

The product of its digits is 32400000, while the sum is 57.

The spelling of 161553126545265 in words is "one hundred sixty-one trillion, five hundred fifty-three billion, one hundred twenty-six million, five hundred forty-five thousand, two hundred sixty-five".