155511665987 has 2 divisors, whose sum is σ = 155511665988. Its totient is φ = 155511665986.

The previous prime is 155511665977. The next prime is 155511666017. The reversal of 155511665987 is 789566115551.

155511665987 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 not a de Polignac number, because 155511665987 - 2⁴ = 155511665971 is a prime.

It is not a weakly prime, because it can be changed into another prime (155511665977) 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, 77755832993 + 77755832994.

It is an arithmetic number, because the mean of its divisors is an integer number (77755832994).

Almost surely, 2^155511665987 is an apocalyptic number.

155511665987 is a deficient number, since it is larger than the sum of its proper divisors (1).

155511665987 is an equidigital number, since it uses as much as digits as its factorization.

155511665987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340000, while the sum is 59.

The spelling of 155511665987 in words is "one hundred fifty-five billion, five hundred eleven million, six hundred sixty-five thousand, nine hundred eighty-seven".