66814747141 has 16 divisors (see below), whose sum is σ = 70912575360. Its totient is φ = 62777090880.

The previous prime is 66814747121. The next prime is 66814747159. The reversal of 66814747141 is 14174741866.

It is a cyclic number.

It is not a de Polignac number, because 66814747141 - 2¹⁷ = 66814616069 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 (66814747121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1158376 + ... + 1214686.

It is an arithmetic number, because the mean of its divisors is an integer number (4432035960).

Almost surely, 2^66814747141 is an apocalyptic number.

It is an amenable number.

66814747141 is a deficient number, since it is larger than the sum of its proper divisors (4097828219).

66814747141 is a wasteful number, since it uses less digits than its factorization.

66814747141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56844.

The product of its digits is 903168, while the sum is 49.

The spelling of 66814747141 in words is "sixty-six billion, eight hundred fourteen million, seven hundred forty-seven thousand, one hundred forty-one".