50554405661 has 2 divisors, whose sum is σ = 50554405662. Its totient is φ = 50554405660.

The previous prime is 50554405633. The next prime is 50554405687. The reversal of 50554405661 is 16650445505.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48856471225 + 1697934436 = 221035^2 + 41206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-50554405661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50554405861) 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, 25277202830 + 25277202831.

It is an arithmetic number, because the mean of its divisors is an integer number (25277202831).

Almost surely, 2^50554405661 is an apocalyptic number.

It is an amenable number.

50554405661 is a deficient number, since it is larger than the sum of its proper divisors (1).

50554405661 is an equidigital number, since it uses as much as digits as its factorization.

50554405661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360000, while the sum is 41.

The spelling of 50554405661 in words is "fifty billion, five hundred fifty-four million, four hundred five thousand, six hundred sixty-one".