1553233021573 has 2 divisors, whose sum is σ = 1553233021574. Its totient is φ = 1553233021572.

The previous prime is 1553233021531. The next prime is 1553233021591. The reversal of 1553233021573 is 3751203323551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1365957862564 + 187275159009 = 1168742^2 + 432753^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1553233021573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1553233021513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776616510786 + 776616510787.

It is an arithmetic number, because the mean of its divisors is an integer number (776616510787).

Almost surely, 2^{1553233021573} is an apocalyptic number.

It is an amenable number.

1553233021573 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553233021573 is an equidigital number, since it uses as much as digits as its factorization.

1553233021573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 283500, while the sum is 40.

The spelling of 1553233021573 in words is "one trillion, five hundred fifty-three billion, two hundred thirty-three million, twenty-one thousand, five hundred seventy-three".