66851005044 has 24 divisors (see below), whose sum is σ = 155992263840. Its totient is φ = 22282727584.

The previous prime is 66851005033. The next prime is 66851005073. The reversal of 66851005044 is 44050015866.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 66851004993 and 66851005011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216442 + ... + 424910.

It is an arithmetic number, because the mean of its divisors is an integer number (6499677660).

Almost surely, 2^66851005044 is an apocalyptic number.

It is an amenable number.

66851005044 is an abundant number, since it is smaller than the sum of its proper divisors (89141258796).

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

66851005044 is a wasteful number, since it uses less digits than its factorization.

66851005044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235199 (or 235197 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The spelling of 66851005044 in words is "sixty-six billion, eight hundred fifty-one million, five thousand, forty-four".