155216323891 has 2 divisors, whose sum is σ = 155216323892. Its totient is φ = 155216323890.

The previous prime is 155216323831. The next prime is 155216323901. The reversal of 155216323891 is 198323612551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155216323891 - 2⁷ = 155216323763 is a prime.

It is not a weakly prime, because it can be changed into another prime (155216323831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77608161945 + 77608161946.

It is an arithmetic number, because the mean of its divisors is an integer number (77608161946).

Almost surely, 2^155216323891 is an apocalyptic number.

155216323891 is a deficient number, since it is larger than the sum of its proper divisors (1).

155216323891 is an equidigital number, since it uses as much as digits as its factorization.

155216323891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 388800, while the sum is 46.

The spelling of 155216323891 in words is "one hundred fifty-five billion, two hundred sixteen million, three hundred twenty-three thousand, eight hundred ninety-one".