6670205516561 has 4 divisors (see below), whose sum is σ = 6670419124224. Its totient is φ = 6669991908900.

The previous prime is 6670205516537. The next prime is 6670205516567. The reversal of 6670205516561 is 1656155020766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6670205516561 - 2¹⁰ = 6670205515537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6670205516567) 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, 106756985 + ... + 106819446.

It is an arithmetic number, because the mean of its divisors is an integer number (1667604781056).

Almost surely, 2^{6670205516561} is an apocalyptic number.

It is an amenable number.

6670205516561 is a deficient number, since it is larger than the sum of its proper divisors (213607663).

6670205516561 is a wasteful number, since it uses less digits than its factorization.

6670205516561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 213607662.

The product of its (nonzero) digits is 2268000, while the sum is 50.

The spelling of 6670205516561 in words is "six trillion, six hundred seventy billion, two hundred five million, five hundred sixteen thousand, five hundred sixty-one".