655240081 has 2 divisors, whose sum is σ = 655240082. Its totient is φ = 655240080.

The previous prime is 655240057. The next prime is 655240127. The reversal of 655240081 is 180042556.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 513249025 + 141991056 = 22655^2 + 11916^2 .

It is a cyclic number.

It is not a de Polignac number, because 655240081 - 2⁵ = 655240049 is a prime.

It is a super-2 number, since 2×655240081² = 858679127497773122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (655240051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327620040 + 327620041.

It is an arithmetic number, because the mean of its divisors is an integer number (327620041).

Almost surely, 2^655240081 is an apocalyptic number.

It is an amenable number.

655240081 is a deficient number, since it is larger than the sum of its proper divisors (1).

655240081 is an equidigital number, since it uses as much as digits as its factorization.

655240081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 655240081 is about 25597.6577248779. The cubic root of 655240081 is about 868.5606538953.

The spelling of 655240081 in words is "six hundred fifty-five million, two hundred forty thousand, eighty-one".