1055505561 has 16 divisors (see below), whose sum is σ = 1537314240. Its totient is φ = 638853120.

The previous prime is 1055505559. The next prime is 1055505601. The reversal of 1055505561 is 1655055501.

It is not a de Polignac number, because 1055505561 - 2¹ = 1055505559 is a prime.

It is a super-2 number, since 2×1055505561² = 2228183978603849442, which contains 22 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 (1055505511) 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, 4581 + ... + 46173.

It is an arithmetic number, because the mean of its divisors is an integer number (96082140).

Almost surely, 2^1055505561 is an apocalyptic number.

1055505561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1055505561 is a deficient number, since it is larger than the sum of its proper divisors (481808679).

1055505561 is a wasteful number, since it uses less digits than its factorization.

1055505561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42376.

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

The square root of 1055505561 is about 32488.5450736102. The cubic root of 1055505561 is about 1018.1697155940.

It can be divided in two parts, 105550 and 5561, that added together give a palindrome (111111).

The spelling of 1055505561 in words is "one billion, fifty-five million, five hundred five thousand, five hundred sixty-one".