54166607681 has 2 divisors, whose sum is σ = 54166607682. Its totient is φ = 54166607680.

The previous prime is 54166607669. The next prime is 54166607687. The reversal of 54166607681 is 18670666145.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48147330625 + 6019277056 = 219425^2 + 77584^2 .

It is a cyclic number.

It is not a de Polignac number, because 54166607681 - 2⁶ = 54166607617 is a prime.

It is a super-2 number, since 2×54166607681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (54166607687) 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, 27083303840 + 27083303841.

It is an arithmetic number, because the mean of its divisors is an integer number (27083303841).

Almost surely, 2^54166607681 is an apocalyptic number.

It is an amenable number.

54166607681 is a deficient number, since it is larger than the sum of its proper divisors (1).

54166607681 is an equidigital number, since it uses as much as digits as its factorization.

54166607681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The spelling of 54166607681 in words is "fifty-four billion, one hundred sixty-six million, six hundred seven thousand, six hundred eighty-one".