1640655041 has 2 divisors, whose sum is σ = 1640655042. Its totient is φ = 1640655040.

The previous prime is 1640655017. The next prime is 1640655043. The reversal of 1640655041 is 1405560461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1640655025 + 16 = 40505^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640655041 - 2¹⁰ = 1640654017 is a prime.

Together with 1640655043, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1640654989 and 1640655007.

It is not a weakly prime, because it can be changed into another prime (1640655043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820327520 + 820327521.

It is an arithmetic number, because the mean of its divisors is an integer number (820327521).

Almost surely, 2^1640655041 is an apocalyptic number.

It is an amenable number.

1640655041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640655041 is an equidigital number, since it uses as much as digits as its factorization.

1640655041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 1640655041 is about 40505.0001975065. Note that the first 3 decimals coincide. The cubic root of 1640655041 is about 1179.4306937270.

The spelling of 1640655041 in words is "one billion, six hundred forty million, six hundred fifty-five thousand, forty-one".