66710838177699 has 4 divisors (see below), whose sum is σ = 88947784236936. Its totient is φ = 44473892118464.

The previous prime is 66710838177679. The next prime is 66710838177703. The reversal of 66710838177699 is 99677183801766.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66710838177699 - 2²⁹ = 66710301306787 is a prime.

It is a super-2 number, since 2×66710838177699² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66710838177679) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11118473029614 + ... + 11118473029619.

It is an arithmetic number, because the mean of its divisors is an integer number (22236946059234).

Almost surely, 2^{66710838177699} is an apocalyptic number.

66710838177699 is a deficient number, since it is larger than the sum of its proper divisors (22236946059237).

66710838177699 is a wasteful number, since it uses less digits than its factorization.

66710838177699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22236946059236.

The product of its (nonzero) digits is 1152216576, while the sum is 78.

The spelling of 66710838177699 in words is "sixty-six trillion, seven hundred ten billion, eight hundred thirty-eight million, one hundred seventy-seven thousand, six hundred ninety-nine".