20165645045407 has 2 divisors, whose sum is σ = 20165645045408. Its totient is φ = 20165645045406.

The previous prime is 20165645045353. The next prime is 20165645045453. The reversal of 20165645045407 is 70454054656102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20165645045407 - 2¹⁹ = 20165644521119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20165645045107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082822522703 + 10082822522704.

It is an arithmetic number, because the mean of its divisors is an integer number (10082822522704).

Almost surely, 2^{20165645045407} is an apocalyptic number.

20165645045407 is a deficient number, since it is larger than the sum of its proper divisors (1).

20165645045407 is an equidigital number, since it uses as much as digits as its factorization.

20165645045407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032000, while the sum is 49.

The spelling of 20165645045407 in words is "twenty trillion, one hundred sixty-five billion, six hundred forty-five million, forty-five thousand, four hundred seven".