1055105661 has 4 divisors (see below), whose sum is σ = 1406807552. Its totient is φ = 703403772.

The previous prime is 1055105633. The next prime is 1055105693. The reversal of 1055105661 is 1665015501.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1055105661 - 2¹⁷ = 1054974589 is a prime.

It is a super-2 number, since 2×1055105661² = 2226495911748493842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1055105461) 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 3 ways as a sum of consecutive naturals, for example, 175850941 + ... + 175850946.

It is an arithmetic number, because the mean of its divisors is an integer number (351701888).

Almost surely, 2^1055105661 is an apocalyptic number.

It is an amenable number.

1055105661 is a deficient number, since it is larger than the sum of its proper divisors (351701891).

1055105661 is an equidigital number, since it uses as much as digits as its factorization.

1055105661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 351701890.

The product of its (nonzero) digits is 4500, while the sum is 30.

The square root of 1055105661 is about 32482.3900136674. The cubic root of 1055105661 is about 1018.0411145026.

The spelling of 1055105661 in words is "one billion, fifty-five million, one hundred five thousand, six hundred sixty-one".