1661000088789 has 16 divisors (see below), whose sum is σ = 2461157971200. Its totient is φ = 1107145698048.

The previous prime is 1661000088779. The next prime is 1661000088817. The reversal of 1661000088789 is 9878800001661.

1661000088789 is a `hidden beast` number, since 16 + 610 + 0 + 0 + 0 + 8 + 8 + 7 + 8 + 9 = 666.

It is not a de Polignac number, because 1661000088789 - 2⁴ = 1661000088773 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1661000088779) 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, 5051404 + ... + 5370165.

It is an arithmetic number, because the mean of its divisors is an integer number (153822373200).

Almost surely, 2^{1661000088789} is an apocalyptic number.

It is an amenable number.

1661000088789 is a deficient number, since it is larger than the sum of its proper divisors (800157882411).

1661000088789 is a wasteful number, since it uses less digits than its factorization.

1661000088789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10427481 (or 10427475 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The spelling of 1661000088789 in words is "one trillion, six hundred sixty-one billion, eighty-eight thousand, seven hundred eighty-nine".