165606655555 has 16 divisors (see below), whose sum is σ = 216805191264. Its totient is φ = 120435079680.

The previous prime is 165606655547. The next prime is 165606655559. The reversal of 165606655555 is 555556606561.

It is not a de Polignac number, because 165606655555 - 2³ = 165606655547 is a prime.

It is a super-2 number, since 2×165606655555² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 165606655496 and 165606655505.

It is not an unprimeable number, because it can be changed into a prime (165606655559) 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, 1209547 + ... + 1339483.

It is an arithmetic number, because the mean of its divisors is an integer number (13550324454).

Almost surely, 2^165606655555 is an apocalyptic number.

165606655555 is a deficient number, since it is larger than the sum of its proper divisors (51198535709).

165606655555 is a wasteful number, since it uses less digits than its factorization.

165606655555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153126.

The product of its (nonzero) digits is 20250000, while the sum is 55.

The spelling of 165606655555 in words is "one hundred sixty-five billion, six hundred six million, six hundred fifty-five thousand, five hundred fifty-five".