1666055611660 has 48 divisors (see below), whose sum is σ = 3865095682560. Its totient is φ = 598169557440.

The previous prime is 1666055611657. The next prime is 1666055611681. The reversal of 1666055611660 is 661165506661.

It is a super-2 number, since 2×1666055611660² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47912874 + ... + 47947633.

It is an arithmetic number, because the mean of its divisors is an integer number (80522826720).

Almost surely, 2^{1666055611660} is an apocalyptic number.

1666055611660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666055611660 is an abundant number, since it is smaller than the sum of its proper divisors (2199040070900).

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

1666055611660 is a wasteful number, since it uses less digits than its factorization.

1666055611660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95860606 (or 95860604 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 1666055611660 in words is "one trillion, six hundred sixty-six billion, fifty-five million, six hundred eleven thousand, six hundred sixty".