1665613099776 has 72 divisors (see below), whose sum is σ = 4474389616704. Its totient is φ = 550015513600.

The previous prime is 1665613099729. The next prime is 1665613099819. The reversal of 1665613099776 is 6779903165661.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10052250 + ... + 10216601.

It is an arithmetic number, because the mean of its divisors is an integer number (62144300232).

Almost surely, 2^{1665613099776} is an apocalyptic number.

1665613099776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1665613099776 is an abundant number, since it is smaller than the sum of its proper divisors (2808776516928).

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

1665613099776 is a wasteful number, since it uses less digits than its factorization.

1665613099776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20268977 (or 20268963 counting only the distinct ones).

The product of its (nonzero) digits is 77157360, while the sum is 66.

The spelling of 1665613099776 in words is "one trillion, six hundred sixty-five billion, six hundred thirteen million, ninety-nine thousand, seven hundred seventy-six".