1566066065657 has 4 divisors (see below), whose sum is σ = 1566068584080. Its totient is φ = 1566063547236.

The previous prime is 1566066065653. The next prime is 1566066065659. The reversal of 1566066065657 is 7565606606651.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1566066065657 - 2² = 1566066065653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1566066065596 and 1566066065605.

It is not an unprimeable number, because it can be changed into a prime (1566066065653) 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, 419894 + ... + 1818912.

It is an arithmetic number, because the mean of its divisors is an integer number (391517146020).

Almost surely, 2^{1566066065657} is an apocalyptic number.

It is an amenable number.

1566066065657 is a deficient number, since it is larger than the sum of its proper divisors (2518423).

1566066065657 is a wasteful number, since it uses less digits than its factorization.

1566066065657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2518422.

The product of its (nonzero) digits is 40824000, while the sum is 59.

The spelling of 1566066065657 in words is "one trillion, five hundred sixty-six billion, sixty-six million, sixty-five thousand, six hundred fifty-seven".