165500670001 has 4 divisors (see below), whose sum is σ = 174211231600. Its totient is φ = 156790108404.

The previous prime is 165500669981. The next prime is 165500670019. The reversal of 165500670001 is 100076005561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 100076005561 = 7 ⋅14296572223.

It is a cyclic number.

It is not a de Polignac number, because 165500670001 - 2²¹ = 165498572849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165500470001) 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, 4355280771 + ... + 4355280808.

It is an arithmetic number, because the mean of its divisors is an integer number (43552807900).

Almost surely, 2^165500670001 is an apocalyptic number.

It is an amenable number.

165500670001 is a deficient number, since it is larger than the sum of its proper divisors (8710561599).

165500670001 is an equidigital number, since it uses as much as digits as its factorization.

165500670001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8710561598.

The product of its (nonzero) digits is 6300, while the sum is 31.

Adding to 165500670001 its reverse (100076005561), we get a palindrome (265576675562).

The spelling of 165500670001 in words is "one hundred sixty-five billion, five hundred million, six hundred seventy thousand, one".