1640165123 has 2 divisors, whose sum is σ = 1640165124. Its totient is φ = 1640165122.

The previous prime is 1640165041. The next prime is 1640165141. The reversal of 1640165123 is 3215610461.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1640165123 - 2²⁰ = 1639116547 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640162123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820082561 + 820082562.

It is an arithmetic number, because the mean of its divisors is an integer number (820082562).

Almost surely, 2^1640165123 is an apocalyptic number.

1640165123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640165123 is an equidigital number, since it uses as much as digits as its factorization.

1640165123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1640165123 is about 40498.9521222463. The cubic root of 1640165123 is about 1179.3132849611.

Adding to 1640165123 its reverse (3215610461), we get a palindrome (4855775584).

The spelling of 1640165123 in words is "one billion, six hundred forty million, one hundred sixty-five thousand, one hundred twenty-three".