665708602477 has 4 divisors (see below), whose sum is σ = 666088358140. Its totient is φ = 665328846816.

The previous prime is 665708602337. The next prime is 665708602487. The reversal of 665708602477 is 774206807566.

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 108497113321 + 557211489156 = 329389^2 + 746466^2 .

It is a cyclic number.

It is not a de Polignac number, because 665708602477 - 2²³ = 665700213869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665708602487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 189875202 + ... + 189878707.

It is an arithmetic number, because the mean of its divisors is an integer number (166522089535).

Almost surely, 2^665708602477 is an apocalyptic number.

It is an amenable number.

665708602477 is a deficient number, since it is larger than the sum of its proper divisors (379755663).

665708602477 is a wasteful number, since it uses less digits than its factorization.

665708602477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379755662.

The product of its (nonzero) digits is 23708160, while the sum is 58.

The spelling of 665708602477 in words is "six hundred sixty-five billion, seven hundred eight million, six hundred two thousand, four hundred seventy-seven".