665615386347 has 8 divisors (see below), whose sum is σ = 887494878720. Its totient is φ = 443739742440.

The previous prime is 665615386333. The next prime is 665615386349. The reversal of 665615386347 is 743683516566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 665615386347 - 2²⁴ = 665598609131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665615386349) 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 7 ways as a sum of consecutive naturals, for example, 530947 + ... + 1270092.

It is an arithmetic number, because the mean of its divisors is an integer number (110936859840).

Almost surely, 2^665615386347 is an apocalyptic number.

665615386347 is a deficient number, since it is larger than the sum of its proper divisors (221879492373).

665615386347 is a wasteful number, since it uses less digits than its factorization.

665615386347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1924233.

The product of its digits is 65318400, while the sum is 60.

The spelling of 665615386347 in words is "six hundred sixty-five billion, six hundred fifteen million, three hundred eighty-six thousand, three hundred forty-seven".