1640500073 has 2 divisors, whose sum is σ = 1640500074. Its totient is φ = 1640500072.

The previous prime is 1640500049. The next prime is 1640500087. The reversal of 1640500073 is 3700050461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1548186409 + 92313664 = 39347^2 + 9608^2 .

It is an emirp because it is prime and its reverse (3700050461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1640500073 - 2²⁴ = 1623722857 is a prime.

It is not a weakly prime, because it can be changed into another prime (1640500003) 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, 820250036 + 820250037.

It is an arithmetic number, because the mean of its divisors is an integer number (820250037).

Almost surely, 2^1640500073 is an apocalyptic number.

It is an amenable number.

1640500073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640500073 is an equidigital number, since it uses as much as digits as its factorization.

1640500073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 1640500073 is about 40503.0872033232. The cubic root of 1640500073 is about 1179.3935581996.

The spelling of 1640500073 in words is "one billion, six hundred forty million, five hundred thousand, seventy-three".