671599505566 has 8 divisors (see below), whose sum is σ = 1098981009144. Its totient is φ = 305272502520.

The previous prime is 671599505561. The next prime is 671599505587. The reversal of 671599505566 is 665505995176.

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

It is a junction number, because it is equal to n+sod(n) for n = 671599505498 and 671599505507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671599505561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15263625105 + ... + 15263625148.

It is an arithmetic number, because the mean of its divisors is an integer number (137372626143).

Almost surely, 2^671599505566 is an apocalyptic number.

671599505566 is a deficient number, since it is larger than the sum of its proper divisors (427381503578).

671599505566 is a wasteful number, since it uses less digits than its factorization.

671599505566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30527250266.

The product of its (nonzero) digits is 76545000, while the sum is 64.

The spelling of 671599505566 in words is "six hundred seventy-one billion, five hundred ninety-nine million, five hundred five thousand, five hundred sixty-six".