165500649987 has 4 divisors (see below), whose sum is σ = 220667533320. Its totient is φ = 110333766656.

The previous prime is 165500649971. The next prime is 165500649989. The reversal of 165500649987 is 789946005561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165500649987 - 2⁴ = 165500649971 is a prime.

It is a super-2 number, since 2×165500649987² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 165500649987.

It is not an unprimeable number, because it can be changed into a prime (165500649989) 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, 27583441662 + ... + 27583441667.

It is an arithmetic number, because the mean of its divisors is an integer number (55166883330).

Almost surely, 2^165500649987 is an apocalyptic number.

165500649987 is a deficient number, since it is larger than the sum of its proper divisors (55166883333).

165500649987 is an equidigital number, since it uses as much as digits as its factorization.

165500649987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55166883332.

The product of its (nonzero) digits is 16329600, while the sum is 60.

The spelling of 165500649987 in words is "one hundred sixty-five billion, five hundred million, six hundred forty-nine thousand, nine hundred eighty-seven".