155393934617 has 2 divisors, whose sum is σ = 155393934618. Its totient is φ = 155393934616.

The previous prime is 155393934517. The next prime is 155393934629. The reversal of 155393934617 is 716439393551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138570807001 + 16823127616 = 372251^2 + 129704^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155393934617 is a prime.

It is not a weakly prime, because it can be changed into another prime (155393934697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77696967308 + 77696967309.

It is an arithmetic number, because the mean of its divisors is an integer number (77696967309).

Almost surely, 2^155393934617 is an apocalyptic number.

It is an amenable number.

155393934617 is a deficient number, since it is larger than the sum of its proper divisors (1).

155393934617 is an equidigital number, since it uses as much as digits as its factorization.

155393934617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9185400, while the sum is 56.

The spelling of 155393934617 in words is "one hundred fifty-five billion, three hundred ninety-three million, nine hundred thirty-four thousand, six hundred seventeen".