165572275561 has 16 divisors (see below), whose sum is σ = 208471621248. Its totient is φ = 127739952000.

The previous prime is 165572275541. The next prime is 165572275607.

It is a happy number.

165572275561 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 165572275561 - 2¹¹ = 165572273513 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165572275499 and 165572275508.

It is not an unprimeable number, because it can be changed into a prime (165572275541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10637220 + ... + 10652773.

It is an arithmetic number, because the mean of its divisors is an integer number (13029476328).

Almost surely, 2^165572275561 is an apocalyptic number.

165572275561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165572275561 is a deficient number, since it is larger than the sum of its proper divisors (42899345687).

165572275561 is a wasteful number, since it uses less digits than its factorization.

165572275561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21290112.

The product of its digits is 4410000, while the sum is 52.

The spelling of 165572275561 in words is "one hundred sixty-five billion, five hundred seventy-two million, two hundred seventy-five thousand, five hundred sixty-one".