20645401459 has 2 divisors, whose sum is σ = 20645401460. Its totient is φ = 20645401458.

The previous prime is 20645401433. The next prime is 20645401471. The reversal of 20645401459 is 95410454602.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20645401459 - 2⁷ = 20645401331 is a prime.

It is not a weakly prime, because it can be changed into another prime (20645401759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10322700729 + 10322700730.

It is an arithmetic number, because the mean of its divisors is an integer number (10322700730).

Almost surely, 2^20645401459 is an apocalyptic number.

20645401459 is a deficient number, since it is larger than the sum of its proper divisors (1).

20645401459 is an equidigital number, since it uses as much as digits as its factorization.

20645401459 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 20645401459 in words is "twenty billion, six hundred forty-five million, four hundred one thousand, four hundred fifty-nine".