54511107821 has 2 divisors, whose sum is σ = 54511107822. Its totient is φ = 54511107820.

The previous prime is 54511107799. The next prime is 54511107877. The reversal of 54511107821 is 12870111545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44963082025 + 9548025796 = 212045^2 + 97714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-54511107821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (54511107421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27255553910 + 27255553911.

It is an arithmetic number, because the mean of its divisors is an integer number (27255553911).

Almost surely, 2^54511107821 is an apocalyptic number.

It is an amenable number.

54511107821 is a deficient number, since it is larger than the sum of its proper divisors (1).

54511107821 is an equidigital number, since it uses as much as digits as its factorization.

54511107821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11200, while the sum is 35.

The spelling of 54511107821 in words is "fifty-four billion, five hundred eleven million, one hundred seven thousand, eight hundred twenty-one".