20601606499 has 2 divisors, whose sum is σ = 20601606500. Its totient is φ = 20601606498.

The previous prime is 20601606469. The next prime is 20601606503. The reversal of 20601606499 is 99460610602.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20601606499 - 2¹³ = 20601598307 is a prime.

It is not a weakly prime, because it can be changed into another prime (20601606439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10300803249 + 10300803250.

It is an arithmetic number, because the mean of its divisors is an integer number (10300803250).

Almost surely, 2^20601606499 is an apocalyptic number.

20601606499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20601606499 is an equidigital number, since it uses as much as digits as its factorization.

20601606499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 20601606499 in words is "twenty billion, six hundred one million, six hundred six thousand, four hundred ninety-nine".