66492172791 has 24 divisors (see below), whose sum is σ = 105272144640. Its totient is φ = 40107286800.

The previous prime is 66492172753. The next prime is 66492172801. The reversal of 66492172791 is 19727129466.

66492172791 is a `hidden beast` number, since 66 + 492 + 1 + 7 + 2 + 7 + 91 = 666.

It is not a de Polignac number, because 66492172791 - 2¹¹ = 66492170743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66492162791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1570671 + ... + 1612448.

It is an arithmetic number, because the mean of its divisors is an integer number (4386339360).

Almost surely, 2^66492172791 is an apocalyptic number.

66492172791 is a deficient number, since it is larger than the sum of its proper divisors (38779971849).

66492172791 is a wasteful number, since it uses less digits than its factorization.

66492172791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3183347 (or 3183344 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The spelling of 66492172791 in words is "sixty-six billion, four hundred ninety-two million, one hundred seventy-two thousand, seven hundred ninety-one".