665656061100 has 144 divisors (see below), whose sum is σ = 1934547014400. Its totient is φ = 176719046400.

The previous prime is 665656061093. The next prime is 665656061101. The reversal of 665656061100 is 1160656566.

It is not an unprimeable number, because it can be changed into a prime (665656061101) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 67023135 + ... + 67033065.

Almost surely, 2^665656061100 is an apocalyptic number.

665656061100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665656061100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (967273507200).

665656061100 is an abundant number, since it is smaller than the sum of its proper divisors (1268890953300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665656061100 is a wasteful number, since it uses less digits than its factorization.

665656061100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10920 (or 10913 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 665656061100 in words is "six hundred sixty-five billion, six hundred fifty-six million, sixty-one thousand, one hundred".