33705720666 has 24 divisors (see below), whose sum is σ = 73164071604. Its totient is φ = 11214469440.

The previous prime is 33705720623. The next prime is 33705720689. The reversal of 33705720666 is 66602750733.

It can be written as a sum of positive squares in 2 ways, for example, as 33681425625 + 24295041 = 183525^2 + 4929^2 .

It is a super-2 number, since 2×33705720666² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1720891 + ... + 1740366.

Almost surely, 2^33705720666 is an apocalyptic number.

33705720666 is an abundant number, since it is smaller than the sum of its proper divisors (39458350938).

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

33705720666 is a wasteful number, since it uses less digits than its factorization.

33705720666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3461806 (or 3461803 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 45.

It can be divided in two parts, 3370 and 5720666, that added together give a triangular number (5724036 = T₃₃₈₃).

The spelling of 33705720666 in words is "thirty-three billion, seven hundred five million, seven hundred twenty thousand, six hundred sixty-six".