1665566050655 has 32 divisors (see below), whose sum is σ = 2164148347200. Its totient is φ = 1223268314112.

The previous prime is 1665566050649. The next prime is 1665566050693. The reversal of 1665566050655 is 5560506655661.

It is not a de Polignac number, because 1665566050655 - 2¹⁴ = 1665566034271 is a prime.

It is a super-2 number, since 2×1665566050655² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1665566050655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13887536 + ... + 14006954.

It is an arithmetic number, because the mean of its divisors is an integer number (67629635850).

Almost surely, 2^{1665566050655} is an apocalyptic number.

1665566050655 is a deficient number, since it is larger than the sum of its proper divisors (498582296545).

1665566050655 is a wasteful number, since it uses less digits than its factorization.

1665566050655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120603.

The product of its (nonzero) digits is 24300000, while the sum is 56.

The spelling of 1665566050655 in words is "one trillion, six hundred sixty-five billion, five hundred sixty-six million, fifty thousand, six hundred fifty-five".