687751546432777 has 2 divisors, whose sum is σ = 687751546432778. Its totient is φ = 687751546432776.

The previous prime is 687751546432703. The next prime is 687751546432787. The reversal of 687751546432777 is 777234645157786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 506687314400656 + 181064232032121 = 22509716^2 + 13456011^2 .

It is a cyclic number.

It is not a de Polignac number, because 687751546432777 - 2⁴³ = 678955453410569 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 687751546432697 and 687751546432706.

It is not a weakly prime, because it can be changed into another prime (687751546432787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343875773216388 + 343875773216389.

It is an arithmetic number, because the mean of its divisors is an integer number (343875773216389).

Almost surely, 2^{687751546432777} is an apocalyptic number.

It is an amenable number.

687751546432777 is a deficient number, since it is larger than the sum of its proper divisors (1).

687751546432777 is an equidigital number, since it uses as much as digits as its factorization.

687751546432777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11616998400, while the sum is 79.

The spelling of 687751546432777 in words is "six hundred eighty-seven trillion, seven hundred fifty-one billion, five hundred forty-six million, four hundred thirty-two thousand, seven hundred seventy-seven".