155216323831 has 2 divisors, whose sum is σ = 155216323832. Its totient is φ = 155216323830.

The previous prime is 155216323817. The next prime is 155216323891. The reversal of 155216323831 is 138323612551.

It is a happy number.

155216323831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155216323831 is a prime.

It is a super-2 number, since 2×155216323831² (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 (155216323891) 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, 77608161915 + 77608161916.

It is an arithmetic number, because the mean of its divisors is an integer number (77608161916).

Almost surely, 2^155216323831 is an apocalyptic number.

155216323831 is a deficient number, since it is larger than the sum of its proper divisors (1).

155216323831 is an equidigital number, since it uses as much as digits as its factorization.

155216323831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 40.

The spelling of 155216323831 in words is "one hundred fifty-five billion, two hundred sixteen million, three hundred twenty-three thousand, eight hundred thirty-one".