1555131553013 has 2 divisors, whose sum is σ = 1555131553014. Its totient is φ = 1555131553012.

The previous prime is 1555131552991. The next prime is 1555131553037. The reversal of 1555131553013 is 3103551315551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1485529505329 + 69602047684 = 1218823^2 + 263822^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1555131553013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555131553513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777565776506 + 777565776507.

It is an arithmetic number, because the mean of its divisors is an integer number (777565776507).

Almost surely, 2^{1555131553013} is an apocalyptic number.

It is an amenable number.

1555131553013 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555131553013 is an equidigital number, since it uses as much as digits as its factorization.

1555131553013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84375, while the sum is 38.

Adding to 1555131553013 its reverse (3103551315551), we get a palindrome (4658682868564).

The spelling of 1555131553013 in words is "one trillion, five hundred fifty-five billion, one hundred thirty-one million, five hundred fifty-three thousand, thirteen".