665656031103 has 8 divisors (see below), whose sum is σ = 1014332999808. Its totient is φ = 380374874904.

The previous prime is 665656031099. The next prime is 665656031129. The reversal of 665656031103 is 301130656566.

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

It is not a de Polignac number, because 665656031103 - 2² = 665656031099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665656031153) 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, 15848953101 + ... + 15848953142.

It is an arithmetic number, because the mean of its divisors is an integer number (126791624976).

Almost surely, 2^665656031103 is an apocalyptic number.

665656031103 is a deficient number, since it is larger than the sum of its proper divisors (348676968705).

665656031103 is a wasteful number, since it uses less digits than its factorization.

665656031103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31697906253.

The product of its (nonzero) digits is 291600, while the sum is 42.

Adding to 665656031103 its reverse (301130656566), we get a palindrome (966786687669).

The spelling of 665656031103 in words is "six hundred sixty-five billion, six hundred fifty-six million, thirty-one thousand, one hundred three".