1640655017 has 2 divisors, whose sum is σ = 1640655018. Its totient is φ = 1640655016.

The previous prime is 1640655011. The next prime is 1640655041. The reversal of 1640655017 is 7105560461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 873143401 + 767511616 = 29549^2 + 27704^2 .

It is an emirp because it is prime and its reverse (7105560461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640655017 - 2⁴ = 1640655001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640655011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820327508 + 820327509.

It is an arithmetic number, because the mean of its divisors is an integer number (820327509).

Almost surely, 2^1640655017 is an apocalyptic number.

It is an amenable number.

1640655017 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640655017 is an equidigital number, since it uses as much as digits as its factorization.

1640655017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 35.

The square root of 1640655017 is about 40504.9999012468. Note that the first 4 decimals coincide. The cubic root of 1640655017 is about 1179.4306879760.

The spelling of 1640655017 in words is "one billion, six hundred forty million, six hundred fifty-five thousand, seventeen".