665470616517 has 32 divisors (see below), whose sum is σ = 1127287584000. Its totient is φ = 380078288064.

The previous prime is 665470616471. The next prime is 665470616537. The reversal of 665470616517 is 715616074566.

It is a happy number.

665470616517 is a `hidden beast` number, since 6 + 6 + 5 + 4 + 7 + 0 + 616 + 5 + 17 = 666.

665470616517 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 665470616517 - 2¹¹ = 665470614469 is a prime.

It is a super-2 number, since 2×665470616517² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665470616537) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 504142 + ... + 1259007.

It is an arithmetic number, because the mean of its divisors is an integer number (35227737000).

Almost surely, 2^665470616517 is an apocalyptic number.

It is an amenable number.

665470616517 is a deficient number, since it is larger than the sum of its proper divisors (461816967483).

665470616517 is a wasteful number, since it uses less digits than its factorization.

665470616517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1765162 (or 1765156 counting only the distinct ones).

The product of its (nonzero) digits is 6350400, while the sum is 54.

The spelling of 665470616517 in words is "six hundred sixty-five billion, four hundred seventy million, six hundred sixteen thousand, five hundred seventeen".