20349949543477 has 2 divisors, whose sum is σ = 20349949543478. Its totient is φ = 20349949543476.

The previous prime is 20349949543457. The next prime is 20349949543549. The reversal of 20349949543477 is 77434594994302.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19555843995601 + 794105547876 = 4422199^2 + 891126^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20349949543477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20349949543457) 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, 10174974771738 + 10174974771739.

It is an arithmetic number, because the mean of its divisors is an integer number (10174974771739).

Almost surely, 2^{20349949543477} is an apocalyptic number.

It is an amenable number.

20349949543477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20349949543477 is an equidigital number, since it uses as much as digits as its factorization.

20349949543477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 823011840, while the sum is 70.

The spelling of 20349949543477 in words is "twenty trillion, three hundred forty-nine billion, nine hundred forty-nine million, five hundred forty-three thousand, four hundred seventy-seven".