66123057849 has 8 divisors (see below), whose sum is σ = 89371804512. Its totient is φ = 43478174880.

The previous prime is 66123057797. The next prime is 66123057859. The reversal of 66123057849 is 94875032166.

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

It is not a de Polignac number, because 66123057849 - 2⁸ = 66123057593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66123057859) 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, 150965667 + ... + 150966104.

It is an arithmetic number, because the mean of its divisors is an integer number (11171475564).

It is a 1-persistent number, because it is pandigital, but 2⋅66123057849 = 132246115698 is not.

Almost surely, 2^66123057849 is an apocalyptic number.

It is an amenable number.

66123057849 is a deficient number, since it is larger than the sum of its proper divisors (23248746663).

66123057849 is a wasteful number, since it uses less digits than its factorization.

66123057849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301931847.

The product of its (nonzero) digits is 2177280, while the sum is 51.

The spelling of 66123057849 in words is "sixty-six billion, one hundred twenty-three million, fifty-seven thousand, eight hundred forty-nine".