620555645634497 has 2 divisors, whose sum is σ = 620555645634498. Its totient is φ = 620555645634496.

The previous prime is 620555645634481. The next prime is 620555645634539. The reversal of 620555645634497 is 794436546555026.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 535174368074896 + 85381277559601 = 23133836^2 + 9240199^2 .

It is a cyclic number.

It is not a de Polignac number, because 620555645634497 - 2⁴ = 620555645634481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 620555645634497.

It is not a weakly prime, because it can be changed into another prime (620555645634427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 310277822817248 + 310277822817249.

It is an arithmetic number, because the mean of its divisors is an integer number (310277822817249).

Almost surely, 2^{620555645634497} is an apocalyptic number.

It is an amenable number.

620555645634497 is a deficient number, since it is larger than the sum of its proper divisors (1).

620555645634497 is an equidigital number, since it uses as much as digits as its factorization.

620555645634497 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3265920000, while the sum is 71.

The spelling of 620555645634497 in words is "six hundred twenty trillion, five hundred fifty-five billion, six hundred forty-five million, six hundred thirty-four thousand, four hundred ninety-seven".