665708602537 has 16 divisors (see below), whose sum is σ = 795462249600. Its totient is φ = 549949200640.

The previous prime is 665708602529. The next prime is 665708602567. The reversal of 665708602537 is 735206807566.

It is a cyclic number.

It is not a de Polignac number, because 665708602537 - 2³ = 665708602529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665708602567) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61372837 + ... + 61383682.

It is an arithmetic number, because the mean of its divisors is an integer number (49716390600).

Almost surely, 2^665708602537 is an apocalyptic number.

It is an amenable number.

665708602537 is a deficient number, since it is larger than the sum of its proper divisors (129753647063).

665708602537 is a wasteful number, since it uses less digits than its factorization.

665708602537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122756576.

The product of its (nonzero) digits is 12700800, while the sum is 55.

The spelling of 665708602537 in words is "six hundred sixty-five billion, seven hundred eight million, six hundred two thousand, five hundred thirty-seven".