665617760620 has 12 divisors (see below), whose sum is σ = 1397797297344. Its totient is φ = 266247104240.

The previous prime is 665617760603. The next prime is 665617760629. The reversal of 665617760620 is 26067716566.

665617760620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (665617760629) 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, 16640443996 + ... + 16640444035.

It is an arithmetic number, because the mean of its divisors is an integer number (116483108112).

Almost surely, 2^665617760620 is an apocalyptic number.

It is an amenable number.

665617760620 is an abundant number, since it is smaller than the sum of its proper divisors (732179536724).

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

665617760620 is a wasteful number, since it uses less digits than its factorization.

665617760620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33280888040 (or 33280888038 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 52.

The spelling of 665617760620 in words is "six hundred sixty-five billion, six hundred seventeen million, seven hundred sixty thousand, six hundred twenty".