665430841658 has 16 divisors (see below), whose sum is σ = 1112054638464. Its totient is φ = 296033062560.

The previous prime is 665430841643. The next prime is 665430841661. The reversal of 665430841658 is 856148034566.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 321774035 + ... + 321776102.

It is an arithmetic number, because the mean of its divisors is an integer number (69503414904).

Almost surely, 2^665430841658 is an apocalyptic number.

665430841658 is a deficient number, since it is larger than the sum of its proper divisors (446623796806).

665430841658 is a wasteful number, since it uses less digits than its factorization.

665430841658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643550197.

The product of its (nonzero) digits is 16588800, while the sum is 56.

It can be divided in two parts, 6654308 and 41658, that added together give a palindrome (6695966).

The spelling of 665430841658 in words is "six hundred sixty-five billion, four hundred thirty million, eight hundred forty-one thousand, six hundred fifty-eight".