1640620017 has 12 divisors (see below), whose sum is σ = 2373735364. Its totient is φ = 1091923200.

The previous prime is 1640619989. The next prime is 1640620123. The reversal of 1640620017 is 7100260461.

1640620017 is a `hidden beast` number, since 1 + 640 + 6 + 2 + 0 + 0 + 17 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1422496656 + 218123361 = 37716^2 + 14769^2 .

It is not a de Polignac number, because 1640620017 - 2⁷ = 1640619889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1640690017) 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 in 11 ways as a sum of consecutive naturals, for example, 146248 + ... + 157065.

Almost surely, 2^1640620017 is an apocalyptic number.

It is an amenable number.

1640620017 is a deficient number, since it is larger than the sum of its proper divisors (733115347).

1640620017 is a wasteful number, since it uses less digits than its factorization.

1640620017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303920 (or 303917 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 1640620017 is about 40504.5678535150. The cubic root of 1640620017 is about 1179.4223010071.

Adding to 1640620017 its reverse (7100260461), we get a palindrome (8740880478).

The spelling of 1640620017 in words is "one billion, six hundred forty million, six hundred twenty thousand, seventeen".