66873999015825 has 48 divisors (see below), whose sum is σ = 111591803917440. Its totient is φ = 35335183098880.

The previous prime is 66873999015821. The next prime is 66873999015937. The reversal of 66873999015825 is 52851099937866.

It is a happy number.

It is not a de Polignac number, because 66873999015825 - 2² = 66873999015821 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66873999015821) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17860084 + ... + 21277466.

It is an arithmetic number, because the mean of its divisors is an integer number (2324829248280).

Almost surely, 2^{66873999015825} is an apocalyptic number.

It is an amenable number.

66873999015825 is a deficient number, since it is larger than the sum of its proper divisors (44717804901615).

66873999015825 is a wasteful number, since it uses less digits than its factorization.

66873999015825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3419818 (or 3419813 counting only the distinct ones).

The product of its (nonzero) digits is 1763596800, while the sum is 78.

The spelling of 66873999015825 in words is "sixty-six trillion, eight hundred seventy-three billion, nine hundred ninety-nine million, fifteen thousand, eight hundred twenty-five".