54571777681 has 2 divisors, whose sum is σ = 54571777682. Its totient is φ = 54571777680.

The previous prime is 54571777607. The next prime is 54571777703. The reversal of 54571777681 is 18677717545.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51638472081 + 2933305600 = 227241^2 + 54160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54571777681 is a prime.

It is a super-2 number, since 2×54571777681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (54571775681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27285888840 + 27285888841.

It is an arithmetic number, because the mean of its divisors is an integer number (27285888841).

Almost surely, 2^54571777681 is an apocalyptic number.

It is an amenable number.

54571777681 is a deficient number, since it is larger than the sum of its proper divisors (1).

54571777681 is an equidigital number, since it uses as much as digits as its factorization.

54571777681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11524800, while the sum is 58.

The spelling of 54571777681 in words is "fifty-four billion, five hundred seventy-one million, seven hundred seventy-seven thousand, six hundred eighty-one".