155611511011 has 16 divisors (see below), whose sum is σ = 173723263488. Its totient is φ = 138172904800.

The previous prime is 155611510979. The next prime is 155611511039. The reversal of 155611511011 is 110115116551.

155611511011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 155611511011 - 2⁵ = 155611510979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (155611511411) 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 in 15 ways as a sum of consecutive naturals, for example, 52660 + ... + 560353.

It is an arithmetic number, because the mean of its divisors is an integer number (10857703968).

Almost surely, 2^155611511011 is an apocalyptic number.

155611511011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

155611511011 is a deficient number, since it is larger than the sum of its proper divisors (18111752477).

155611511011 is a wasteful number, since it uses less digits than its factorization.

155611511011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613562.

The product of its (nonzero) digits is 750, while the sum is 28.

Adding to 155611511011 its reverse (110115116551), we get a palindrome (265726627562).

The spelling of 155611511011 in words is "one hundred fifty-five billion, six hundred eleven million, five hundred eleven thousand, eleven".