155540159813 has 2 divisors, whose sum is σ = 155540159814. Its totient is φ = 155540159812.

The previous prime is 155540159713. The next prime is 155540159869. The reversal of 155540159813 is 318951045551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79740158689 + 75800001124 = 282383^2 + 275318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155540159813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155540159893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77770079906 + 77770079907.

It is an arithmetic number, because the mean of its divisors is an integer number (77770079907).

Almost surely, 2^155540159813 is an apocalyptic number.

It is an amenable number.

155540159813 is a deficient number, since it is larger than the sum of its proper divisors (1).

155540159813 is an equidigital number, since it uses as much as digits as its factorization.

155540159813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 540000, while the sum is 47.

The spelling of 155540159813 in words is "one hundred fifty-five billion, five hundred forty million, one hundred fifty-nine thousand, eight hundred thirteen".