677551285721 has 2 divisors, whose sum is σ = 677551285722. Its totient is φ = 677551285720.

The previous prime is 677551285699. The next prime is 677551285739. The reversal of 677551285721 is 127582155776.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 672090075721 + 5461210000 = 819811^2 + 73900^2 .

It is a cyclic number.

It is not a de Polignac number, because 677551285721 - 2¹⁸ = 677551023577 is a prime.

It is not a weakly prime, because it can be changed into another prime (677551285771) 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, 338775642860 + 338775642861.

It is an arithmetic number, because the mean of its divisors is an integer number (338775642861).

Almost surely, 2^677551285721 is an apocalyptic number.

It is an amenable number.

677551285721 is a deficient number, since it is larger than the sum of its proper divisors (1).

677551285721 is an equidigital number, since it uses as much as digits as its factorization.

677551285721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8232000, while the sum is 56.

The spelling of 677551285721 in words is "six hundred seventy-seven billion, five hundred fifty-one million, two hundred eighty-five thousand, seven hundred twenty-one".