665100016100 has 36 divisors (see below), whose sum is σ = 1554287579124. Its totient is φ = 245575390080.

The previous prime is 665100016079. The next prime is 665100016129. The reversal of 665100016100 is 1610001566.

It can be written as a sum of positive squares in 6 ways, for example, as 2009011684 + 663091004416 = 44822^2 + 814304^2 .

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 665100016100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255806399 + ... + 255808998.

Almost surely, 2^665100016100 is an apocalyptic number.

It is an amenable number.

665100016100 is an abundant number, since it is smaller than the sum of its proper divisors (889187563024).

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

665100016100 is a wasteful number, since it uses less digits than its factorization.

665100016100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 511615424 (or 511615417 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 665100016100 its reverse (1610001566), we get a palindrome (666710017666).

The spelling of 665100016100 in words is "six hundred sixty-five billion, one hundred million, sixteen thousand, one hundred".