16255640789 has 2 divisors, whose sum is σ = 16255640790. Its totient is φ = 16255640788.

The previous prime is 16255640743. The next prime is 16255640801. The reversal of 16255640789 is 98704655261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12483592900 + 3772047889 = 111730^2 + 61417^2 .

It is a cyclic number.

It is not a de Polignac number, because 16255640789 - 2²⁰ = 16254592213 is a prime.

It is a super-2 number, since 2×16255640789² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16255640789.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16255640689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8127820394 + 8127820395.

It is an arithmetic number, because the mean of its divisors is an integer number (8127820395).

Almost surely, 2^16255640789 is an apocalyptic number.

It is an amenable number.

16255640789 is a deficient number, since it is larger than the sum of its proper divisors (1).

16255640789 is an equidigital number, since it uses as much as digits as its factorization.

16255640789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3628800, while the sum is 53.

The spelling of 16255640789 in words is "sixteen billion, two hundred fifty-five million, six hundred forty thousand, seven hundred eighty-nine".