66780000001 has 24 divisors (see below), whose sum is σ = 79260228000. Its totient is φ = 55773244800.

The previous prime is 66779999999. The next prime is 66780000011. The reversal of 66780000001 is 10000008766.

It is not a de Polignac number, because 66780000001 - 2¹ = 66779999999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66780000011) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 307125 + ... + 477373.

It is an arithmetic number, because the mean of its divisors is an integer number (3302509500).

Almost surely, 2^66780000001 is an apocalyptic number.

It is an amenable number.

66780000001 is a deficient number, since it is larger than the sum of its proper divisors (12480227999).

66780000001 is a wasteful number, since it uses less digits than its factorization.

66780000001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170497 (or 170484 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

Adding to 66780000001 its reverse (10000008766), we get a palindrome (76780008767).

The spelling of 66780000001 in words is "sixty-six billion, seven hundred eighty million, one", and thus it is an aban number.