1566115566655 has 8 divisors (see below), whose sum is σ = 1879355377152. Its totient is φ = 1252881321888.

The previous prime is 1566115566637. The next prime is 1566115566661. The reversal of 1566115566655 is 5566655116651.

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

It is a cyclic number.

It is not a de Polignac number, because 1566115566655 - 2⁹ = 1566115566143 is a prime.

It is a super-2 number, since 2×1566115566655² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1566115566655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 745087 + ... + 1920256.

It is an arithmetic number, because the mean of its divisors is an integer number (234919422144).

Almost surely, 2^{1566115566655} is an apocalyptic number.

1566115566655 is a deficient number, since it is larger than the sum of its proper divisors (313239810497).

1566115566655 is a wasteful number, since it uses less digits than its factorization.

1566115566655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2782865.

The product of its digits is 24300000, while the sum is 58.

The spelling of 1566115566655 in words is "one trillion, five hundred sixty-six billion, one hundred fifteen million, five hundred sixty-six thousand, six hundred fifty-five".