20291715553 has 2 divisors, whose sum is σ = 20291715554. Its totient is φ = 20291715552.

The previous prime is 20291715527. The next prime is 20291715643. The reversal of 20291715553 is 35551719202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11987403169 + 8304312384 = 109487^2 + 91128^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20291715553 is a prime.

It is not a weakly prime, because it can be changed into another prime (20291715503) 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, 10145857776 + 10145857777.

It is an arithmetic number, because the mean of its divisors is an integer number (10145857777).

Almost surely, 2^20291715553 is an apocalyptic number.

It is an amenable number.

20291715553 is a deficient number, since it is larger than the sum of its proper divisors (1).

20291715553 is an equidigital number, since it uses as much as digits as its factorization.

20291715553 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 94500, while the sum is 40.

The spelling of 20291715553 in words is "twenty billion, two hundred ninety-one million, seven hundred fifteen thousand, five hundred fifty-three".