545503366691081 has 2 divisors, whose sum is σ = 545503366691082. Its totient is φ = 545503366691080.

The previous prime is 545503366691047. The next prime is 545503366691117. The reversal of 545503366691081 is 180196663305545.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 396127060449481 + 149376306241600 = 19902941^2 + 12221960^2 .

It is a cyclic number.

It is not a de Polignac number, because 545503366691081 - 2³⁸ = 545228488784137 is a prime.

It is a super-2 number, since 2×545503366691081² (a number of 30 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (545503366591081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 272751683345540 + 272751683345541.

It is an arithmetic number, because the mean of its divisors is an integer number (272751683345541).

Almost surely, 2^{545503366691081} is an apocalyptic number.

It is an amenable number.

545503366691081 is a deficient number, since it is larger than the sum of its proper divisors (1).

545503366691081 is an equidigital number, since it uses as much as digits as its factorization.

545503366691081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69984000, while the sum is 62.

The spelling of 545503366691081 in words is "five hundred forty-five trillion, five hundred three billion, three hundred sixty-six million, six hundred ninety-one thousand, eighty-one".