20531554499 has 2 divisors, whose sum is σ = 20531554500. Its totient is φ = 20531554498.

The previous prime is 20531554471. The next prime is 20531554501. The reversal of 20531554499 is 99445513502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20531554499 - 2¹⁶ = 20531488963 is a prime.

Together with 20531554501, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (20531554699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10265777249 + 10265777250.

It is an arithmetic number, because the mean of its divisors is an integer number (10265777250).

Almost surely, 2^20531554499 is an apocalyptic number.

20531554499 is a deficient number, since it is larger than the sum of its proper divisors (1).

20531554499 is an equidigital number, since it uses as much as digits as its factorization.

20531554499 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 20531554499 in words is "twenty billion, five hundred thirty-one million, five hundred fifty-four thousand, four hundred ninety-nine".