665161500111 has 8 divisors (see below), whose sum is σ = 887776940544. Its totient is φ = 442993529880.

The previous prime is 665161500109. The next prime is 665161500119. The reversal of 665161500111 is 111005161566.

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

It is not a de Polignac number, because 665161500111 - 2¹ = 665161500109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665161500119) 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, 111864081 + ... + 111870026.

It is an arithmetic number, because the mean of its divisors is an integer number (110972117568).

Almost surely, 2^665161500111 is an apocalyptic number.

665161500111 is a deficient number, since it is larger than the sum of its proper divisors (222615440433).

665161500111 is a wasteful number, since it uses less digits than its factorization.

665161500111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223735101.

The product of its (nonzero) digits is 5400, while the sum is 33.

Adding to 665161500111 its reverse (111005161566), we get a palindrome (776166661677).

The spelling of 665161500111 in words is "six hundred sixty-five billion, one hundred sixty-one million, five hundred thousand, one hundred eleven".