655120649 has 2 divisors, whose sum is σ = 655120650. Its totient is φ = 655120648.

The previous prime is 655120603. The next prime is 655120699. The reversal of 655120649 is 946021556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 481012624 + 174108025 = 21932^2 + 13195^2 .

It is a cyclic number.

It is not a de Polignac number, because 655120649 - 2¹⁶ = 655055113 is a prime.

It is not a weakly prime, because it can be changed into another prime (655120699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327560324 + 327560325.

It is an arithmetic number, because the mean of its divisors is an integer number (327560325).

Almost surely, 2^655120649 is an apocalyptic number.

It is an amenable number.

655120649 is a deficient number, since it is larger than the sum of its proper divisors (1).

655120649 is an equidigital number, since it uses as much as digits as its factorization.

655120649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The square root of 655120649 is about 25595.3247488677. The cubic root of 655120649 is about 868.5078792242.

The spelling of 655120649 in words is "six hundred fifty-five million, one hundred twenty thousand, six hundred forty-nine".