1617672788789 has 4 divisors (see below), whose sum is σ = 1617683527020. Its totient is φ = 1617662050560.

The previous prime is 1617672788779. The next prime is 1617672788791. The reversal of 1617672788789 is 9878872767161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 989941421764 + 627731367025 = 994958^2 + 792295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1617672788789 - 2⁸ = 1617672788533 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 (1617672788749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5139884 + ... + 5445525.

It is an arithmetic number, because the mean of its divisors is an integer number (404420881755).

Almost surely, 2^{1617672788789} is an apocalyptic number.

It is an amenable number.

1617672788789 is a deficient number, since it is larger than the sum of its proper divisors (10738231).

1617672788789 is a wasteful number, since it uses less digits than its factorization.

1617672788789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10738230.

The product of its digits is 796594176, while the sum is 77.

The spelling of 1617672788789 in words is "one trillion, six hundred seventeen billion, six hundred seventy-two million, seven hundred eighty-eight thousand, seven hundred eighty-nine".