66000000001 has 8 divisors (see below), whose sum is σ = 73527851880. Its totient is φ = 58822280832.

The previous prime is 65999999999. The next prime is 66000000013. The reversal of 66000000001 is 10000000066.

It can be written as a sum of positive squares in 4 ways, for example, as 1268428225 + 64731571776 = 35615^2 + 254424^2 .

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 66000000001 - 2¹ = 65999999999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66000000041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87532780 + ... + 87533533.

It is an arithmetic number, because the mean of its divisors is an integer number (9190981485).

Almost surely, 2^66000000001 is an apocalyptic number.

It is an amenable number.

66000000001 is a deficient number, since it is larger than the sum of its proper divisors (7527851879).

66000000001 is a wasteful number, since it uses less digits than its factorization.

66000000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175066355.

The product of its (nonzero) digits is 36, while the sum is 13.

Adding to 66000000001 its reverse (10000000066), we get a palindrome (76000000067).

The spelling of 66000000001 in words is "sixty-six billion, one", and thus it is an aban number and an uban number.