1155820638503 has 2 divisors, whose sum is σ = 1155820638504. Its totient is φ = 1155820638502.

The previous prime is 1155820638431. The next prime is 1155820638529. The reversal of 1155820638503 is 3058360285511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1155820638503 - 2¹⁴ = 1155820622119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1155820638563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 577910319251 + 577910319252.

It is an arithmetic number, because the mean of its divisors is an integer number (577910319252).

Almost surely, 2^{1155820638503} is an apocalyptic number.

1155820638503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1155820638503 is an equidigital number, since it uses as much as digits as its factorization.

1155820638503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864000, while the sum is 47.

The spelling of 1155820638503 in words is "one trillion, one hundred fifty-five billion, eight hundred twenty million, six hundred thirty-eight thousand, five hundred three".