66705786371 has 6 divisors (see below), whose sum is σ = 77596527060. Its totient is φ = 57176388276.

The previous prime is 66705786353. The next prime is 66705786421. The reversal of 66705786371 is 17368750766.

It is not a de Polignac number, because 66705786371 - 2²⁶ = 66638677507 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66705786331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 680671241 + ... + 680671338.

It is an arithmetic number, because the mean of its divisors is an integer number (12932754510).

Almost surely, 2^66705786371 is an apocalyptic number.

66705786371 is a deficient number, since it is larger than the sum of its proper divisors (10890740689).

66705786371 is a wasteful number, since it uses less digits than its factorization.

66705786371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361342593 (or 1361342586 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 56.

The spelling of 66705786371 in words is "sixty-six billion, seven hundred five million, seven hundred eighty-six thousand, three hundred seventy-one".