54197617861 has 2 divisors, whose sum is σ = 54197617862. Its totient is φ = 54197617860.

The previous prime is 54197617853. The next prime is 54197617867. The reversal of 54197617861 is 16871679145.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45528890625 + 8668727236 = 213375^2 + 93106^2 .

It is a cyclic number.

It is not a de Polignac number, because 54197617861 - 2³ = 54197617853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54197617867) 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, 27098808930 + 27098808931.

It is an arithmetic number, because the mean of its divisors is an integer number (27098808931).

Almost surely, 2^54197617861 is an apocalyptic number.

It is an amenable number.

54197617861 is a deficient number, since it is larger than the sum of its proper divisors (1).

54197617861 is an equidigital number, since it uses as much as digits as its factorization.

54197617861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2540160, while the sum is 55.

The spelling of 54197617861 in words is "fifty-four billion, one hundred ninety-seven million, six hundred seventeen thousand, eight hundred sixty-one".