1055545661 has 2 divisors, whose sum is σ = 1055545662. Its totient is φ = 1055545660.

The previous prime is 1055545643. The next prime is 1055545717. The reversal of 1055545661 is 1665455501.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1043677636 + 11868025 = 32306^2 + 3445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1055545661 is a prime.

It is a super-2 number, since 2×1055545661² = 2228353284911853842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1055545961) 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 as a sum of consecutive naturals, namely, 527772830 + 527772831.

It is an arithmetic number, because the mean of its divisors is an integer number (527772831).

Almost surely, 2^1055545661 is an apocalyptic number.

It is an amenable number.

1055545661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1055545661 is an equidigital number, since it uses as much as digits as its factorization.

1055545661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90000, while the sum is 38.

The square root of 1055545661 is about 32489.1622083426. The cubic root of 1055545661 is about 1018.1826092852.

The spelling of 1055545661 in words is "one billion, fifty-five million, five hundred forty-five thousand, six hundred sixty-one".