66541366543 has 2 divisors, whose sum is σ = 66541366544. Its totient is φ = 66541366542.

The previous prime is 66541366457. The next prime is 66541366547. The reversal of 66541366543 is 34566314566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66541366543 - 2²⁹ = 66004495631 is a prime.

It is a super-2 number, since 2×66541366543² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66541366547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33270683271 + 33270683272.

It is an arithmetic number, because the mean of its divisors is an integer number (33270683272).

Almost surely, 2^66541366543 is an apocalyptic number.

66541366543 is a deficient number, since it is larger than the sum of its proper divisors (1).

66541366543 is an equidigital number, since it uses as much as digits as its factorization.

66541366543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4665600, while the sum is 49.

The spelling of 66541366543 in words is "sixty-six billion, five hundred forty-one million, three hundred sixty-six thousand, five hundred forty-three".