1606050661 has 2 divisors, whose sum is σ = 1606050662.
Its totient is φ = 1606050660.
The previous prime is 1606050659. The next prime is 1606050737. The reversal of 1606050661 is 1660506061.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 1429293636 + 176757025 = 37806^2 + 13295^2
It is an emirp because it is prime and its reverse (1660506061) is a distict prime.
It is a cyclic number.
It is not a de Polignac number, because 1606050661 - 21 = 1606050659 is a prime.
It is a super-4 number, since 4×16060506614 (a number of 38 digits) contains 4444 as substring.
Together with 1606050659, it forms a pair of twin primes.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (1606059661) 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, 803025330 + 803025331.
It is an arithmetic number, because the mean of its divisors is an integer number (803025331).
Almost surely, 21606050661 is an apocalyptic number.
It is an amenable number.
1606050661 is a deficient number, since it is larger than the sum of its proper divisors (1).
1606050661 is an equidigital number, since it uses as much as digits as its factorization.
1606050661 is an odious number, because the sum of its binary digits is odd.
The product of its (nonzero) digits is 6480, while the sum is 31.
The square root of 1606050661 is about 40075.5618925050.
The cubic root of 1606050661 is about 1171.0795940183.
The spelling of 1606050661 in words is "one billion, six hundred six million, fifty thousand, six hundred sixty-one".