155115677317 has 4 divisors (see below), whose sum is σ = 156488382540. Its totient is φ = 153742972096.

The previous prime is 155115677293. The next prime is 155115677347. The reversal of 155115677317 is 713776511551.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 65038260676 + 90077416641 = 255026^2 + 300129^2 .

It is a cyclic number.

It is not a de Polignac number, because 155115677317 - 2¹¹ = 155115675269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155115677347) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 686352442 + ... + 686352667.

It is an arithmetic number, because the mean of its divisors is an integer number (39122095635).

Almost surely, 2^155115677317 is an apocalyptic number.

It is an amenable number.

155115677317 is a deficient number, since it is larger than the sum of its proper divisors (1372705223).

155115677317 is a wasteful number, since it uses less digits than its factorization.

155115677317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372705222.

The product of its digits is 771750, while the sum is 49.

The spelling of 155115677317 in words is "one hundred fifty-five billion, one hundred fifteen million, six hundred seventy-seven thousand, three hundred seventeen".