1661920745183 has 8 divisors (see below), whose sum is σ = 1675205476560. Its totient is φ = 1648652737600.

The previous prime is 1661920745179. The next prime is 1661920745203. The reversal of 1661920745183 is 3815470291661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1661920745183 - 2² = 1661920745179 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661920745153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3981368 + ... + 4378941.

It is an arithmetic number, because the mean of its divisors is an integer number (209400684570).

It is a 1-persistent number, because it is pandigital, but 2⋅1661920745183 = 3323841490366 is not.

Almost surely, 2^{1661920745183} is an apocalyptic number.

1661920745183 is a deficient number, since it is larger than the sum of its proper divisors (13284731377).

1661920745183 is a wasteful number, since it uses less digits than its factorization.

1661920745183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8361897.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 1661920745183 in words is "one trillion, six hundred sixty-one billion, nine hundred twenty million, seven hundred forty-five thousand, one hundred eighty-three".