655438769 has 2 divisors, whose sum is σ = 655438770. Its totient is φ = 655438768.

The previous prime is 655438753. The next prime is 655438781. The reversal of 655438769 is 967834556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 424854544 + 230584225 = 20612^2 + 15185^2 .

It is a cyclic number.

It is not a de Polignac number, because 655438769 - 2⁴ = 655438753 is a prime.

It is a super-2 number, since 2×655438769² = 859199959816470722, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 655438769.

It is not a weakly prime, because it can be changed into another prime (655438709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327719384 + 327719385.

It is an arithmetic number, because the mean of its divisors is an integer number (327719385).

Almost surely, 2^655438769 is an apocalyptic number.

It is an amenable number.

655438769 is a deficient number, since it is larger than the sum of its proper divisors (1).

655438769 is an equidigital number, since it uses as much as digits as its factorization.

655438769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5443200, while the sum is 53.

The square root of 655438769 is about 25601.5384108065. The cubic root of 655438769 is about 868.6484360401.

The spelling of 655438769 in words is "six hundred fifty-five million, four hundred thirty-eight thousand, seven hundred sixty-nine".