54805189961 has 2 divisors, whose sum is σ = 54805189962. Its totient is φ = 54805189960.

The previous prime is 54805189949. The next prime is 54805189979. The reversal of 54805189961 is 16998150845.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34653684025 + 20151505936 = 186155^2 + 141956^2 .

It is a cyclic number.

It is not a de Polignac number, because 54805189961 - 2¹⁰ = 54805188937 is a prime.

It is a super-2 number, since 2×54805189961² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 54805189897 and 54805189906.

It is not a weakly prime, because it can be changed into another prime (54805189931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27402594980 + 27402594981.

It is an arithmetic number, because the mean of its divisors is an integer number (27402594981).

Almost surely, 2^54805189961 is an apocalyptic number.

It is an amenable number.

54805189961 is a deficient number, since it is larger than the sum of its proper divisors (1).

54805189961 is an equidigital number, since it uses as much as digits as its factorization.

54805189961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3110400, while the sum is 56.

The spelling of 54805189961 in words is "fifty-four billion, eight hundred five million, one hundred eighty-nine thousand, nine hundred sixty-one".