20199257459 has 2 divisors, whose sum is σ = 20199257460. Its totient is φ = 20199257458.

The previous prime is 20199257453. The next prime is 20199257471. The reversal of 20199257459 is 95475299102.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20199257459 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20199257459.

It is not a weakly prime, because it can be changed into another prime (20199257453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10099628729 + 10099628730.

It is an arithmetic number, because the mean of its divisors is an integer number (10099628730).

Almost surely, 2^20199257459 is an apocalyptic number.

20199257459 is a deficient number, since it is larger than the sum of its proper divisors (1).

20199257459 is an equidigital number, since it uses as much as digits as its factorization.

20199257459 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2041200, while the sum is 53.

The spelling of 20199257459 in words is "twenty billion, one hundred ninety-nine million, two hundred fifty-seven thousand, four hundred fifty-nine".