1166570621 has 2 divisors, whose sum is σ = 1166570622. Its totient is φ = 1166570620.

The previous prime is 1166570609. The next prime is 1166570677. The reversal of 1166570621 is 1260756611.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1163764996 + 2805625 = 34114^2 + 1675^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1166570621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1166570921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 583285310 + 583285311.

It is an arithmetic number, because the mean of its divisors is an integer number (583285311).

Almost surely, 2^1166570621 is an apocalyptic number.

It is an amenable number.

1166570621 is a deficient number, since it is larger than the sum of its proper divisors (1).

1166570621 is an equidigital number, since it uses as much as digits as its factorization.

1166570621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 1166570621 is about 34155.0965596644. The cubic root of 1166570621 is about 1052.6977102943.

It can be divided in two parts, 1166 and 570621, that added together give a cube (571787 = 83³).

The spelling of 1166570621 in words is "one billion, one hundred sixty-six million, five hundred seventy thousand, six hundred twenty-one".