1299765657623 has 2 divisors, whose sum is σ = 1299765657624. Its totient is φ = 1299765657622.

The previous prime is 1299765657587. The next prime is 1299765657643. The reversal of 1299765657623 is 3267565679921.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1299765657623 - 2⁶ = 1299765657559 is a prime.

It is a super-2 number, since 2×1299765657623² (a number of 25 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1299765657643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 649882828811 + 649882828812.

It is an arithmetic number, because the mean of its divisors is an integer number (649882828812).

Almost surely, 2^{1299765657623} is an apocalyptic number.

1299765657623 is a deficient number, since it is larger than the sum of its proper divisors (1).

1299765657623 is an equidigital number, since it uses as much as digits as its factorization.

1299765657623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 257191200, while the sum is 68.

The spelling of 1299765657623 in words is "one trillion, two hundred ninety-nine billion, seven hundred sixty-five million, six hundred fifty-seven thousand, six hundred twenty-three".