660106655605 has 4 divisors (see below), whose sum is σ = 792127986732. Its totient is φ = 528085324480.

The previous prime is 660106655531. The next prime is 660106655647. The reversal of 660106655605 is 506556601066.

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

It can be written as a sum of positive squares in 2 ways, for example, as 484090326756 + 176016328849 = 695766^2 + 419543^2 .

It is not a de Polignac number, because 660106655605 - 2⁷ = 660106655477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66010665556 + ... + 66010665565.

It is an arithmetic number, because the mean of its divisors is an integer number (198031996683).

Almost surely, 2^660106655605 is an apocalyptic number.

It is an amenable number.

660106655605 is a deficient number, since it is larger than the sum of its proper divisors (132021331127).

660106655605 is a wasteful number, since it uses less digits than its factorization.

660106655605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132021331126.

The product of its (nonzero) digits is 972000, while the sum is 46.

The spelling of 660106655605 in words is "six hundred sixty billion, one hundred six million, six hundred fifty-five thousand, six hundred five".