1666389613772 has 48 divisors (see below), whose sum is σ = 3169688417280. Its totient is φ = 761957238528.

The previous prime is 1666389613771. The next prime is 1666389613783. The reversal of 1666389613772 is 2773169836661.

It is a junction number, because it is equal to n+sod(n) for n = 1666389613699 and 1666389613708.

It is not an unprimeable number, because it can be changed into a prime (1666389613771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85083893 + ... + 85103475.

It is an arithmetic number, because the mean of its divisors is an integer number (66035175360).

Almost surely, 2^{1666389613772} is an apocalyptic number.

It is an amenable number.

1666389613772 is a deficient number, since it is larger than the sum of its proper divisors (1503298803508).

1666389613772 is a wasteful number, since it uses less digits than its factorization.

1666389613772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34722 (or 34720 counting only the distinct ones).

The product of its digits is 82301184, while the sum is 65.

The spelling of 1666389613772 in words is "one trillion, six hundred sixty-six billion, three hundred eighty-nine million, six hundred thirteen thousand, seven hundred seventy-two".