66875857794 has 40 divisors (see below), whose sum is σ = 149866472448. Its totient is φ = 22289719320.

The previous prime is 66875857787. The next prime is 66875857831. The reversal of 66875857794 is 49775857866.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2714359 + ... + 2738885.

Almost surely, 2^66875857794 is an apocalyptic number.

66875857794 is an abundant number, since it is smaller than the sum of its proper divisors (82990614654).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66875857794 is a wasteful number, since it uses less digits than its factorization.

66875857794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41372 (or 41363 counting only the distinct ones).

The product of its digits is 711244800, while the sum is 72.

Adding to 66875857794 its sum of digits (72), we get a palindrome (66875857866).

The spelling of 66875857794 in words is "sixty-six billion, eight hundred seventy-five million, eight hundred fifty-seven thousand, seven hundred ninety-four".