1665727011760 has 80 divisors (see below), whose sum is σ = 4475805940800. Its totient is φ = 564689461248.

The previous prime is 1665727011667. The next prime is 1665727011827. The reversal of 1665727011760 is 671107275661.

It is a tau number, because it is divible by the number of its divisors (80).

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, 16660905 + ... + 16760584.

It is an arithmetic number, because the mean of its divisors is an integer number (55947574260).

Almost surely, 2^{1665727011760} is an apocalyptic number.

1665727011760 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665727011760 is an abundant number, since it is smaller than the sum of its proper divisors (2810078929040).

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

1665727011760 is a wasteful number, since it uses less digits than its factorization.

1665727011760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33421598 (or 33421592 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 49.

The spelling of 1665727011760 in words is "one trillion, six hundred sixty-five billion, seven hundred twenty-seven million, eleven thousand, seven hundred sixty".