66067646705 has 8 divisors (see below), whose sum is σ = 79683619752. Its totient is φ = 52585821568.

The previous prime is 66067646629. The next prime is 66067646719. The reversal of 66067646705 is 50764676066.

It is a happy number.

66067646705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 31587241984 + 34480404721 = 177728^2 + 185689^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66067646705 - 2¹⁶ = 66067581169 is a prime.

It is a super-2 number, since 2×66067646705² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33535892 + ... + 33537861.

It is an arithmetic number, because the mean of its divisors is an integer number (9960452469).

Almost surely, 2^66067646705 is an apocalyptic number.

It is an amenable number.

66067646705 is a deficient number, since it is larger than the sum of its proper divisors (13615973047).

66067646705 is a wasteful number, since it uses less digits than its factorization.

66067646705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67073955.

The product of its (nonzero) digits is 7620480, while the sum is 53.

The spelling of 66067646705 in words is "sixty-six billion, sixty-seven million, six hundred forty-six thousand, seven hundred five".