20365665503 has 2 divisors, whose sum is σ = 20365665504. Its totient is φ = 20365665502.

The previous prime is 20365665499. The next prime is 20365665521. The reversal of 20365665503 is 30556656302.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20365665503 - 2² = 20365665499 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20365664503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10182832751 + 10182832752.

It is an arithmetic number, because the mean of its divisors is an integer number (10182832752).

Almost surely, 2^20365665503 is an apocalyptic number.

20365665503 is a deficient number, since it is larger than the sum of its proper divisors (1).

20365665503 is an equidigital number, since it uses as much as digits as its factorization.

20365665503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486000, while the sum is 41.

The spelling of 20365665503 in words is "twenty billion, three hundred sixty-five million, six hundred sixty-five thousand, five hundred three".