1664165932409 has 2 divisors, whose sum is σ = 1664165932410. Its totient is φ = 1664165932408.

The previous prime is 1664165932399. The next prime is 1664165932519. The reversal of 1664165932409 is 9042395614661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1159384102009 + 504781830400 = 1076747^2 + 710480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1664165932409 is a prime.

It is not a weakly prime, because it can be changed into another prime (1664165931409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 832082966204 + 832082966205.

It is an arithmetic number, because the mean of its divisors is an integer number (832082966205).

Almost surely, 2^{1664165932409} is an apocalyptic number.

It is an amenable number.

1664165932409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1664165932409 is an equidigital number, since it uses as much as digits as its factorization.

1664165932409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8398080, while the sum is 56.

The spelling of 1664165932409 in words is "one trillion, six hundred sixty-four billion, one hundred sixty-five million, nine hundred thirty-two thousand, four hundred nine".