655550789 has 2 divisors, whose sum is σ = 655550790. Its totient is φ = 655550788.

The previous prime is 655550767. The next prime is 655550809. The reversal of 655550789 is 987055556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 654489889 + 1060900 = 25583^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 655550789 - 2²⁴ = 638773573 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655550729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327775394 + 327775395.

It is an arithmetic number, because the mean of its divisors is an integer number (327775395).

Almost surely, 2^655550789 is an apocalyptic number.

It is an amenable number.

655550789 is a deficient number, since it is larger than the sum of its proper divisors (1).

655550789 is an equidigital number, since it uses as much as digits as its factorization.

655550789 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890000, while the sum is 50.

The square root of 655550789 is about 25603.7260764913. The cubic root of 655550789 is about 868.6979196631.

The spelling of 655550789 in words is "six hundred fifty-five million, five hundred fifty thousand, seven hundred eighty-nine".