660963370709 has 4 divisors (see below), whose sum is σ = 699843569004. Its totient is φ = 622083172416.

The previous prime is 660963370621. The next prime is 660963370721. The reversal of 660963370709 is 907073369066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 907073369066 = 2 ⋅453536684533.

It can be written as a sum of positive squares in 2 ways, for example, as 440929200625 + 220034170084 = 664025^2 + 469078^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-660963370709 is a prime.

It is a super-3 number, since 3×660963370709³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660963370799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19440099122 + ... + 19440099155.

It is an arithmetic number, because the mean of its divisors is an integer number (174960892251).

Almost surely, 2^660963370709 is an apocalyptic number.

It is an amenable number.

660963370709 is a deficient number, since it is larger than the sum of its proper divisors (38880198295).

660963370709 is a wasteful number, since it uses less digits than its factorization.

660963370709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38880198294.

The product of its (nonzero) digits is 7715736, while the sum is 56.

The spelling of 660963370709 in words is "six hundred sixty billion, nine hundred sixty-three million, three hundred seventy thousand, seven hundred nine".