1252661355641 has 2 divisors, whose sum is σ = 1252661355642. Its totient is φ = 1252661355640.

The previous prime is 1252661355571. The next prime is 1252661355679. The reversal of 1252661355641 is 1465531662521.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 863591055616 + 389070300025 = 929296^2 + 623755^2 .

It is an emirp because it is prime and its reverse (1465531662521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1252661355641 - 2³⁰ = 1251587613817 is a prime.

It is not a weakly prime, because it can be changed into another prime (1252661355691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 626330677820 + 626330677821.

It is an arithmetic number, because the mean of its divisors is an integer number (626330677821).

Almost surely, 2^{1252661355641} is an apocalyptic number.

It is an amenable number.

1252661355641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1252661355641 is an equidigital number, since it uses as much as digits as its factorization.

1252661355641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296000, while the sum is 47.

The spelling of 1252661355641 in words is "one trillion, two hundred fifty-two billion, six hundred sixty-one million, three hundred fifty-five thousand, six hundred forty-one".