50861721563 has 2 divisors, whose sum is σ = 50861721564. Its totient is φ = 50861721562.

The previous prime is 50861721553. The next prime is 50861721593. The reversal of 50861721563 is 36512716805.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50861721563 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (50861721523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25430860781 + 25430860782.

It is an arithmetic number, because the mean of its divisors is an integer number (25430860782).

Almost surely, 2^50861721563 is an apocalyptic number.

50861721563 is a deficient number, since it is larger than the sum of its proper divisors (1).

50861721563 is an equidigital number, since it uses as much as digits as its factorization.

50861721563 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 50861721563 in words is "fifty billion, eight hundred sixty-one million, seven hundred twenty-one thousand, five hundred sixty-three".