66237139543 has 4 divisors (see below), whose sum is σ = 66319015680. Its totient is φ = 66155263408.

The previous prime is 66237139537. The next prime is 66237139571. The reversal of 66237139543 is 34593173266.

66237139543 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66237139543 - 2²⁹ = 65700268631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66237139643) 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, 40936855 + ... + 40938472.

It is an arithmetic number, because the mean of its divisors is an integer number (16579753920).

Almost surely, 2^66237139543 is an apocalyptic number.

66237139543 is a deficient number, since it is larger than the sum of its proper divisors (81876137).

66237139543 is an equidigital number, since it uses as much as digits as its factorization.

66237139543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81876136.

The product of its digits is 2449440, while the sum is 49.

The spelling of 66237139543 in words is "sixty-six billion, two hundred thirty-seven million, one hundred thirty-nine thousand, five hundred forty-three".