66706673703720 has 64 divisors (see below), whose sum is σ = 200121326464320. Its totient is φ = 17788330289664.

The previous prime is 66706673703679. The next prime is 66706673703731. The reversal of 66706673703720 is 2730737660766.

It is a happy number.

It is a super-2 number, since 2×66706673703720² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17515572 + ... + 20981148.

It is an arithmetic number, because the mean of its divisors is an integer number (3126895726005).

Almost surely, 2^{66706673703720} is an apocalyptic number.

66706673703720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66706673703720 is an abundant number, since it is smaller than the sum of its proper divisors (133414652760600).

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

66706673703720 is a wasteful number, since it uses less digits than its factorization.

66706673703720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3625994 (or 3625990 counting only the distinct ones).

The product of its (nonzero) digits is 56010528, while the sum is 60.

The spelling of 66706673703720 in words is "sixty-six trillion, seven hundred six billion, six hundred seventy-three million, seven hundred three thousand, seven hundred twenty".