660505054877 has 2 divisors, whose sum is σ = 660505054878. Its totient is φ = 660505054876.

The previous prime is 660505054873. The next prime is 660505054883. The reversal of 660505054877 is 778450505066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 568416476356 + 92088578521 = 753934^2 + 303461^2 .

It is a cyclic number.

It is not a de Polignac number, because 660505054877 - 2² = 660505054873 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (660505054873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 330252527438 + 330252527439.

It is an arithmetic number, because the mean of its divisors is an integer number (330252527439).

Almost surely, 2^660505054877 is an apocalyptic number.

It is an amenable number.

660505054877 is a deficient number, since it is larger than the sum of its proper divisors (1).

660505054877 is an equidigital number, since it uses as much as digits as its factorization.

660505054877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7056000, while the sum is 53.

The spelling of 660505054877 in words is "six hundred sixty billion, five hundred five million, fifty-four thousand, eight hundred seventy-seven".