1665566651056 has 60 divisors (see below), whose sum is σ = 4095161810280. Its totient is φ = 648922068480.

The previous prime is 1665566651051. The next prime is 1665566651083. The reversal of 1665566651056 is 6501566655661.

It is a super-2 number, since 2×1665566651056² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1665566651051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96557161 + ... + 96574408.

It is an arithmetic number, because the mean of its divisors is an integer number (68252696838).

Almost surely, 2^{1665566651056} is an apocalyptic number.

1665566651056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1665566651056 is an abundant number, since it is smaller than the sum of its proper divisors (2429595159224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665566651056 is a wasteful number, since it uses less digits than its factorization.

1665566651056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193131602 (or 193131589 counting only the distinct ones).

The product of its (nonzero) digits is 29160000, while the sum is 58.

The spelling of 1665566651056 in words is "one trillion, six hundred sixty-five billion, five hundred sixty-six million, six hundred fifty-one thousand, fifty-six".