1606506257 has 2 divisors, whose sum is σ = 1606506258. Its totient is φ = 1606506256.

The previous prime is 1606506203. The next prime is 1606506263. The reversal of 1606506257 is 7526056061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1398685201 + 207821056 = 37399^2 + 14416^2 .

It is an emirp because it is prime and its reverse (7526056061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1606506257 - 2¹⁸ = 1606244113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1606506257.

It is not a weakly prime, because it can be changed into another prime (1606536257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803253128 + 803253129.

It is an arithmetic number, because the mean of its divisors is an integer number (803253129).

Almost surely, 2^1606506257 is an apocalyptic number.

It is an amenable number.

1606506257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606506257 is an equidigital number, since it uses as much as digits as its factorization.

1606506257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 1606506257 is about 40081.2457016994. The cubic root of 1606506257 is about 1171.1903187813.

The spelling of 1606506257 in words is "one billion, six hundred six million, five hundred six thousand, two hundred fifty-seven".