155173820231 has 2 divisors, whose sum is σ = 155173820232. Its totient is φ = 155173820230.

The previous prime is 155173820177. The next prime is 155173820257. The reversal of 155173820231 is 132028371551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155173820231 - 2⁶ = 155173820167 is a prime.

It is a super-2 number, since 2×155173820231² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155173820531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77586910115 + 77586910116.

It is an arithmetic number, because the mean of its divisors is an integer number (77586910116).

Almost surely, 2^155173820231 is an apocalyptic number.

155173820231 is a deficient number, since it is larger than the sum of its proper divisors (1).

155173820231 is an equidigital number, since it uses as much as digits as its factorization.

155173820231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 50400, while the sum is 38.

The spelling of 155173820231 in words is "one hundred fifty-five billion, one hundred seventy-three million, eight hundred twenty thousand, two hundred thirty-one".