66071906874 has 40 divisors (see below), whose sum is σ = 148825214208. Its totient is φ = 21908649960.

The previous prime is 66071906861. The next prime is 66071906917. The reversal of 66071906874 is 47860917066.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66071906874.

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, 1036732 + ... + 1098615.

Almost surely, 2^66071906874 is an apocalyptic number.

66071906874 is an abundant number, since it is smaller than the sum of its proper divisors (82753307334).

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

66071906874 is a wasteful number, since it uses less digits than its factorization.

66071906874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2135552 (or 2135543 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 66071906874 in words is "sixty-six billion, seventy-one million, nine hundred six thousand, eight hundred seventy-four".