66703777777671 has 16 divisors (see below), whose sum is σ = 89622821882880. Its totient is φ = 44127001343360.

The previous prime is 66703777777657. The next prime is 66703777777697. The reversal of 66703777777671 is 17677777730766.

It is a cyclic number.

It is not a de Polignac number, because 66703777777671 - 2⁶ = 66703777777607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66703777777621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1144495 + ... + 11606783.

It is an arithmetic number, because the mean of its divisors is an integer number (5601426367680).

Almost surely, 2^{66703777777671} is an apocalyptic number.

66703777777671 is a deficient number, since it is larger than the sum of its proper divisors (22919044105209).

66703777777671 is a wasteful number, since it uses less digits than its factorization.

66703777777671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10478646.

The product of its (nonzero) digits is 3735591048, while the sum is 78.

The spelling of 66703777777671 in words is "sixty-six trillion, seven hundred three billion, seven hundred seventy-seven million, seven hundred seventy-seven thousand, six hundred seventy-one".