665665570100 has 18 divisors (see below), whose sum is σ = 1444494287334. Its totient is φ = 266266228000.

The previous prime is 665665570099. The next prime is 665665570121. The reversal of 665665570100 is 1075566566.

It can be written as a sum of positive squares in 3 ways, for example, as 69304774564 + 596360795536 = 263258^2 + 772244^2 .

It is a super-2 number, since 2×665665570100² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3328327751 + ... + 3328327950.

Almost surely, 2^665665570100 is an apocalyptic number.

It is an amenable number.

665665570100 is an abundant number, since it is smaller than the sum of its proper divisors (778828717234).

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

665665570100 is a wasteful number, since it uses less digits than its factorization.

665665570100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6656655715 (or 6656655708 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 665665570100 in words is "six hundred sixty-five billion, six hundred sixty-five million, five hundred seventy thousand, one hundred".