1566006515661 has 64 divisors (see below), whose sum is σ = 2534431044096. Its totient is φ = 839636582400.

The previous prime is 1566006515639. The next prime is 1566006515677. The reversal of 1566006515661 is 1665156006651.

It is not a de Polignac number, because 1566006515661 - 2¹¹ = 1566006513613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1566006515661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1566006515681) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 296533341 + ... + 296538621.

It is an arithmetic number, because the mean of its divisors is an integer number (39600485064).

Almost surely, 2^{1566006515661} is an apocalyptic number.

It is an amenable number.

1566006515661 is a deficient number, since it is larger than the sum of its proper divisors (968424528435).

1566006515661 is a wasteful number, since it uses less digits than its factorization.

1566006515661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7702.

The product of its (nonzero) digits is 972000, while the sum is 48.

The spelling of 1566006515661 in words is "one trillion, five hundred sixty-six billion, six million, five hundred fifteen thousand, six hundred sixty-one".