655405563797 has 2 divisors, whose sum is σ = 655405563798. Its totient is φ = 655405563796.

The previous prime is 655405563793. The next prime is 655405563821. The reversal of 655405563797 is 797365504556.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 455023098916 + 200382464881 = 674554^2 + 447641^2 .

It is a cyclic number.

It is not a de Polignac number, because 655405563797 - 2² = 655405563793 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655405563793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327702781898 + 327702781899.

It is an arithmetic number, because the mean of its divisors is an integer number (327702781899).

Almost surely, 2^655405563797 is an apocalyptic number.

It is an amenable number.

655405563797 is a deficient number, since it is larger than the sum of its proper divisors (1).

655405563797 is an equidigital number, since it uses as much as digits as its factorization.

655405563797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070000, while the sum is 62.

The spelling of 655405563797 in words is "six hundred fifty-five billion, four hundred five million, five hundred sixty-three thousand, seven hundred ninety-seven".