1606750861 has 2 divisors, whose sum is σ = 1606750862. Its totient is φ = 1606750860.

The previous prime is 1606750819. The next prime is 1606750867. The reversal of 1606750861 is 1680576061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1420837636 + 185913225 = 37694^2 + 13635^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606750861 - 2⁹ = 1606750349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1606750867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803375430 + 803375431.

It is an arithmetic number, because the mean of its divisors is an integer number (803375431).

Almost surely, 2^1606750861 is an apocalyptic number.

It is an amenable number.

1606750861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606750861 is an equidigital number, since it uses as much as digits as its factorization.

1606750861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 60480, while the sum is 40.

The square root of 1606750861 is about 40084.2969378284. The cubic root of 1606750861 is about 1171.2497569352.

The spelling of 1606750861 in words is "one billion, six hundred six million, seven hundred fifty thousand, eight hundred sixty-one".