1242553685773 has 2 divisors, whose sum is σ = 1242553685774. Its totient is φ = 1242553685772.

The previous prime is 1242553685759. The next prime is 1242553685839. The reversal of 1242553685773 is 3775863552421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1178566441924 + 63987243849 = 1085618^2 + 252957^2 .

It is an emirp because it is prime and its reverse (3775863552421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1242553685773 - 2¹³ = 1242553677581 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1242553685713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621276842886 + 621276842887.

It is an arithmetic number, because the mean of its divisors is an integer number (621276842887).

Almost surely, 2^{1242553685773} is an apocalyptic number.

It is an amenable number.

1242553685773 is a deficient number, since it is larger than the sum of its proper divisors (1).

1242553685773 is an equidigital number, since it uses as much as digits as its factorization.

1242553685773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42336000, while the sum is 58.

The spelling of 1242553685773 in words is "one trillion, two hundred forty-two billion, five hundred fifty-three million, six hundred eighty-five thousand, seven hundred seventy-three".