66850312158 has 96 divisors (see below), whose sum is σ = 174312403200. Its totient is φ = 18087971328.

The previous prime is 66850312147. The next prime is 66850312169. The reversal of 66850312158 is 85121305866.

It is an interprime number because it is at equal distance from previous prime (66850312147) and next prime (66850312169).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12333573 + ... + 12338991.

It is an arithmetic number, because the mean of its divisors is an integer number (1815754200).

Almost surely, 2^66850312158 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66850312158, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87156201600).

66850312158 is an abundant number, since it is smaller than the sum of its proper divisors (107462091042).

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

66850312158 is a wasteful number, since it uses less digits than its factorization.

66850312158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10606 (or 10603 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 66850312158 in words is "sixty-six billion, eight hundred fifty million, three hundred twelve thousand, one hundred fifty-eight".