1223455566787 has 2 divisors, whose sum is σ = 1223455566788. Its totient is φ = 1223455566786.

The previous prime is 1223455566761. The next prime is 1223455566793. The reversal of 1223455566787 is 7876655543221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1223455566787 - 2⁷ = 1223455566659 is a prime.

It is not a weakly prime, because it can be changed into another prime (1223455566287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 611727783393 + 611727783394.

It is an arithmetic number, because the mean of its divisors is an integer number (611727783394).

Almost surely, 2^{1223455566787} is an apocalyptic number.

1223455566787 is a deficient number, since it is larger than the sum of its proper divisors (1).

1223455566787 is an equidigital number, since it uses as much as digits as its factorization.

1223455566787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672000, while the sum is 61.

The spelling of 1223455566787 in words is "one trillion, two hundred twenty-three billion, four hundred fifty-five million, five hundred sixty-six thousand, seven hundred eighty-seven".