165518487481 has 8 divisors (see below), whose sum is σ = 166373760960. Its totient is φ = 164665388688.

The previous prime is 165518487473. The next prime is 165518487527. The reversal of 165518487481 is 184784815561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165518487481 - 2³ = 165518487473 is a prime.

It is a super-2 number, since 2×165518487481² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165518487401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390946 + ... + 695611.

It is an arithmetic number, because the mean of its divisors is an integer number (20796720120).

Almost surely, 2^165518487481 is an apocalyptic number.

It is an amenable number.

165518487481 is a deficient number, since it is larger than the sum of its proper divisors (855273479).

165518487481 is a wasteful number, since it uses less digits than its factorization.

165518487481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087343.

The product of its digits is 8601600, while the sum is 58.

The spelling of 165518487481 in words is "one hundred sixty-five billion, five hundred eighteen million, four hundred eighty-seven thousand, four hundred eighty-one".