66234543827 has 4 divisors (see below), whose sum is σ = 67223119176. Its totient is φ = 65245968480.

The previous prime is 66234543763. The next prime is 66234543857. The reversal of 66234543827 is 72834543266.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66234543827 - 2⁶ = 66234543763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66234543857) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494287574 + ... + 494287707.

It is an arithmetic number, because the mean of its divisors is an integer number (16805779794).

Almost surely, 2^66234543827 is an apocalyptic number.

66234543827 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

66234543827 is a deficient number, since it is larger than the sum of its proper divisors (988575349).

66234543827 is an equidigital number, since it uses as much as digits as its factorization.

66234543827 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988575348.

The product of its digits is 5806080, while the sum is 50.

The spelling of 66234543827 in words is "sixty-six billion, two hundred thirty-four million, five hundred forty-three thousand, eight hundred twenty-seven".