20781292559 has 2 divisors, whose sum is σ = 20781292560. Its totient is φ = 20781292558.

The previous prime is 20781292537. The next prime is 20781292627. The reversal of 20781292559 is 95529218702.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20781292559 - 2²⁸ = 20512857103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20781294559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10390646279 + 10390646280.

It is an arithmetic number, because the mean of its divisors is an integer number (10390646280).

Almost surely, 2^20781292559 is an apocalyptic number.

20781292559 is a deficient number, since it is larger than the sum of its proper divisors (1).

20781292559 is an equidigital number, since it uses as much as digits as its factorization.

20781292559 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 907200, while the sum is 50.

The spelling of 20781292559 in words is "twenty billion, seven hundred eighty-one million, two hundred ninety-two thousand, five hundred fifty-nine".