505561155 has 32 divisors (see below), whose sum is σ = 906294528. Its totient is φ = 238492800.

The previous prime is 505561129. The next prime is 505561157. The reversal of 505561155 is 551165505.

It is not a de Polignac number, because 505561155 - 2⁵ = 505561123 is a prime.

It is a super-3 number, since 3×505561155³ (a number of 27 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (505561157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35301 + ... + 47510.

It is an arithmetic number, because the mean of its divisors is an integer number (28321704).

Almost surely, 2^505561155 is an apocalyptic number.

505561155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

505561155 is a deficient number, since it is larger than the sum of its proper divisors (400733373).

505561155 is a wasteful number, since it uses less digits than its factorization.

505561155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82867.

The product of its (nonzero) digits is 18750, while the sum is 33.

The square root of 505561155 is about 22484.6871225730. The cubic root of 505561155 is about 796.6322778486.

The spelling of 505561155 in words is "five hundred five million, five hundred sixty-one thousand, one hundred fifty-five".