155517133813 has 2 divisors, whose sum is σ = 155517133814. Its totient is φ = 155517133812.

The previous prime is 155517133771. The next prime is 155517133841. The reversal of 155517133813 is 318331715551.

It is a happy number.

155517133813 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150115177809 + 5401956004 = 387447^2 + 73498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155517133813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155517133813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155517133913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77758566906 + 77758566907.

It is an arithmetic number, because the mean of its divisors is an integer number (77758566907).

Almost surely, 2^155517133813 is an apocalyptic number.

It is an amenable number.

155517133813 is a deficient number, since it is larger than the sum of its proper divisors (1).

155517133813 is an equidigital number, since it uses as much as digits as its factorization.

155517133813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 189000, while the sum is 43.

The spelling of 155517133813 in words is "one hundred fifty-five billion, five hundred seventeen million, one hundred thirty-three thousand, eight hundred thirteen".