155343211987 has 2 divisors, whose sum is σ = 155343211988. Its totient is φ = 155343211986.

The previous prime is 155343211921. The next prime is 155343212029. The reversal of 155343211987 is 789112343551.

155343211987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155343211987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155343211987.

It is not a weakly prime, because it can be changed into another prime (155343214987) 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, 77671605993 + 77671605994.

It is an arithmetic number, because the mean of its divisors is an integer number (77671605994).

Almost surely, 2^155343211987 is an apocalyptic number.

155343211987 is a deficient number, since it is larger than the sum of its proper divisors (1).

155343211987 is an equidigital number, since it uses as much as digits as its factorization.

155343211987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 907200, while the sum is 49.

The spelling of 155343211987 in words is "one hundred fifty-five billion, three hundred forty-three million, two hundred eleven thousand, nine hundred eighty-seven".