1664500793 has 2 divisors, whose sum is σ = 1664500794. Its totient is φ = 1664500792.

The previous prime is 1664500781. The next prime is 1664500807. The reversal of 1664500793 is 3970054661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 962674729 + 701826064 = 31027^2 + 26492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664500793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1664500793.

It is not a weakly prime, because it can be changed into another prime (1664500193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832250396 + 832250397.

It is an arithmetic number, because the mean of its divisors is an integer number (832250397).

Almost surely, 2^1664500793 is an apocalyptic number.

It is an amenable number.

1664500793 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664500793 is an equidigital number, since it uses as much as digits as its factorization.

1664500793 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 136080, while the sum is 41.

The square root of 1664500793 is about 40798.2939961955. The cubic root of 1664500793 is about 1185.1172934275.

The spelling of 1664500793 in words is "one billion, six hundred sixty-four million, five hundred thousand, seven hundred ninety-three".