1553381800349 has 2 divisors, whose sum is σ = 1553381800350. Its totient is φ = 1553381800348.

The previous prime is 1553381800301. The next prime is 1553381800351. The reversal of 1553381800349 is 9430081833551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966127794724 + 587254005625 = 982918^2 + 766325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553381800349 - 2¹⁶ = 1553381734813 is a prime.

Together with 1553381800351, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1553381800297 and 1553381800306.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1553381830349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776690900174 + 776690900175.

It is an arithmetic number, because the mean of its divisors is an integer number (776690900175).

Almost surely, 2^{1553381800349} is an apocalyptic number.

It is an amenable number.

1553381800349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553381800349 is an equidigital number, since it uses as much as digits as its factorization.

1553381800349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 50.

The spelling of 1553381800349 in words is "one trillion, five hundred fifty-three billion, three hundred eighty-one million, eight hundred thousand, three hundred forty-nine".