645354370477 has 2 divisors, whose sum is σ = 645354370478. Its totient is φ = 645354370476.

The previous prime is 645354370457. The next prime is 645354370487. The reversal of 645354370477 is 774073453546.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 575859393316 + 69494977161 = 758854^2 + 263619^2 .

It is a cyclic number.

It is not a de Polignac number, because 645354370477 - 2³⁹ = 95598556589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (645354370417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 322677185238 + 322677185239.

It is an arithmetic number, because the mean of its divisors is an integer number (322677185239).

Almost surely, 2^645354370477 is an apocalyptic number.

It is an amenable number.

645354370477 is a deficient number, since it is larger than the sum of its proper divisors (1).

645354370477 is an equidigital number, since it uses as much as digits as its factorization.

645354370477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29635200, while the sum is 55.

The spelling of 645354370477 in words is "six hundred forty-five billion, three hundred fifty-four million, three hundred seventy thousand, four hundred seventy-seven".