66181292791 has 8 divisors (see below), whose sum is σ = 70100593344. Its totient is φ = 62264912640.

The previous prime is 66181292789. The next prime is 66181292797. The reversal of 66181292791 is 19729218166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66181292791 - 2¹ = 66181292789 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 (66181292797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 683350 + ... + 774163.

It is an arithmetic number, because the mean of its divisors is an integer number (8762574168).

Almost surely, 2^66181292791 is an apocalyptic number.

66181292791 is a deficient number, since it is larger than the sum of its proper divisors (3919300553).

66181292791 is a wasteful number, since it uses less digits than its factorization.

66181292791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1460201.

The product of its digits is 653184, while the sum is 52.

The spelling of 66181292791 in words is "sixty-six billion, one hundred eighty-one million, two hundred ninety-two thousand, seven hundred ninety-one".