665511122 has 4 divisors (see below), whose sum is σ = 998266686. Its totient is φ = 332755560.

The previous prime is 665511103. The next prime is 665511149. The reversal of 665511122 is 221115566.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 396846241 + 268664881 = 19921^2 + 16391^2 .

It is a zygodrome in base 10.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166377779 + ... + 166377782.

Almost surely, 2^665511122 is an apocalyptic number.

665511122 is a deficient number, since it is larger than the sum of its proper divisors (332755564).

665511122 is a wasteful number, since it uses less digits than its factorization.

665511122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332755563.

The product of its digits is 3600, while the sum is 29.

The square root of 665511122 is about 25797.5022434343. The cubic root of 665511122 is about 873.0754422123.

Adding to 665511122 its reverse (221115566), we get a palindrome (886626688).

The spelling of 665511122 in words is "six hundred sixty-five million, five hundred eleven thousand, one hundred twenty-two".