1555502780093 has 2 divisors, whose sum is σ = 1555502780094. Its totient is φ = 1555502780092.

The previous prime is 1555502780081. The next prime is 1555502780173. The reversal of 1555502780093 is 3900872055551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1485956124004 + 69546656089 = 1218998^2 + 263717^2 .

It is a cyclic number.

It is not a de Polignac number, because 1555502780093 - 2¹⁰ = 1555502779069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1555502780033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 777751390046 + 777751390047.

It is an arithmetic number, because the mean of its divisors is an integer number (777751390047).

Almost surely, 2^{1555502780093} is an apocalyptic number.

It is an amenable number.

1555502780093 is a deficient number, since it is larger than the sum of its proper divisors (1).

1555502780093 is an equidigital number, since it uses as much as digits as its factorization.

1555502780093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890000, while the sum is 50.

The spelling of 1555502780093 in words is "one trillion, five hundred fifty-five billion, five hundred two million, seven hundred eighty thousand, ninety-three".