1666055000565 has 48 divisors (see below), whose sum is σ = 2935995519600. Its totient is φ = 873860198400.

The previous prime is 1666055000539. The next prime is 1666055000629. The reversal of 1666055000565 is 5650005506661.

It can be written as a sum of positive squares in 8 ways, for example, as 180052554276 + 1486002446289 = 424326^2 + 1219017^2 .

It is not a de Polignac number, because 1666055000565 - 2¹² = 1666054996469 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1666055000565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 552892 + ... + 1907301.

It is an arithmetic number, because the mean of its divisors is an integer number (61166573325).

Almost surely, 2^{1666055000565} is an apocalyptic number.

1666055000565 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1666055000565 is a deficient number, since it is larger than the sum of its proper divisors (1269940519035).

1666055000565 is a wasteful number, since it uses less digits than its factorization.

1666055000565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2460454 (or 2460451 counting only the distinct ones).

The product of its (nonzero) digits is 810000, while the sum is 45.

The spelling of 1666055000565 in words is "one trillion, six hundred sixty-six billion, fifty-five million, five hundred sixty-five", and thus it is an aban number.