66800006667 has 8 divisors (see below), whose sum is σ = 98962972880. Its totient is φ = 44533337760.

The previous prime is 66800006659. The next prime is 66800006671. The reversal of 66800006667 is 76660000866.

It is a happy number.

It is not a de Polignac number, because 66800006667 - 2³ = 66800006659 is a prime.

It is a super-2 number, since 2×66800006667² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66800006617) 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, 1237037134 + ... + 1237037187.

It is an arithmetic number, because the mean of its divisors is an integer number (12370371610).

Almost surely, 2^66800006667 is an apocalyptic number.

66800006667 is a deficient number, since it is larger than the sum of its proper divisors (32162966213).

66800006667 is a wasteful number, since it uses less digits than its factorization.

66800006667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2474074330 (or 2474074324 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The spelling of 66800006667 in words is "sixty-six billion, eight hundred million, six thousand, six hundred sixty-seven".