1645116257 has 2 divisors, whose sum is σ = 1645116258. Its totient is φ = 1645116256.

The previous prime is 1645116251. The next prime is 1645116281. The reversal of 1645116257 is 7526115461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1231237921 + 413878336 = 35089^2 + 20344^2 .

It is a cyclic number.

It is not a de Polignac number, because 1645116257 - 2⁴ = 1645116241 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1645116257.

It is not a weakly prime, because it can be changed into another prime (1645116251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 822558128 + 822558129.

It is an arithmetic number, because the mean of its divisors is an integer number (822558129).

Almost surely, 2^1645116257 is an apocalyptic number.

It is an amenable number.

1645116257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1645116257 is an equidigital number, since it uses as much as digits as its factorization.

1645116257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 38.

The square root of 1645116257 is about 40560.0327539315. The cubic root of 1645116257 is about 1180.4987494727.

The spelling of 1645116257 in words is "one billion, six hundred forty-five million, one hundred sixteen thousand, two hundred fifty-seven".