155505011 has 2 divisors, whose sum is σ = 155505012. Its totient is φ = 155505010.

The previous prime is 155504957. The next prime is 155505037. The reversal of 155505011 is 110505551.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155505011 is a prime.

It is a super-2 number, since 2×155505011² = 48363616892220242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155505041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77752505 + 77752506.

It is an arithmetic number, because the mean of its divisors is an integer number (77752506).

Almost surely, 2^155505011 is an apocalyptic number.

155505011 is a deficient number, since it is larger than the sum of its proper divisors (1).

155505011 is an equidigital number, since it uses as much as digits as its factorization.

155505011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 625, while the sum is 23.

The square root of 155505011 is about 12470.1648345160. The cubic root of 155505011 is about 537.7512923405.

The spelling of 155505011 in words is "one hundred fifty-five million, five hundred five thousand, eleven".